Welcome aboard!
Yahhhh the time management is definitely borderline the hardest part lmao. Like sure, you have to put a lot of work and effort into improving and all that but.... in order to do so at all you have to make time to work! Eugh! I'm still pretty new to this as well (I began my first 70-page one shot October 2018 and wrapped it up December 2019, along with some other smaller projects along the way: a 6 page group collaboration project, as well as a 10 page short story for an anthology). And currently on a break before starting my next one-shot (a continuation of the first one, a season 2 of sorts). Along the way these are the time management tips I've come up with:
Get into a steady drawing habit.
This is honestly super important imo. If you don't really get into the habit of drawing a lot and working towards finishing your goal it'll take forever to get there and the longer it takes the more demoralizing it has the potential to be (especially if you aren't seeing big results). This was the biggest first step for me- I used to draw quite a bit back in highschool but then kinda slowed way down in university afterwards. After graduating and deciding I wanted to get back into drawing more I decided to just tackle that year's Inktober (my first one, in 2017) and committed to doing the whole thing. That was the kickstart I needed to get back into the habit lol. A challenge like that also just helps you seek out and find the times that are available to draw even where you might not have seen them otherwise. After work when you're tired? Squeeze out a half hour if you can. On a weekend and you just want to play videogames or whatever? Divide that time up and allocate some of it toward drawing as well. Going to a concert that will last late into the night? I legit did one of my inktober drawings that year at a 24 hour cafe that we went to eat at afterwards- I brought a ballpoint pen with me and did a quick doodle just to get the drawing in for the day xD sure it was just this atrocity 
, but even so:
Like of course, once Inktober ended I stopped being nearly that OCD about trying to draw literally every day no matter what... but I was still drawing a lot more than I had prior and that was what I needed to launch into my comic the following year~
Despite the above, be kind to yourself and take breaks when you need them. As often as you need them. No exceptions!
Unless you become a professional contracted comic artist, it's always always to take breaks from your comic. While feeling burned out, or when something at work or school comes up, or just when you're feeling stressed. Put it down for a week or two and try to come back refreshed. I've found it's a way worse time sink to try and force yourself to work on the comic while feeling legitimately out of it than it is to just take the break when you need one.
I'll second Cavechan a few replies up, working on drawing speed, imo, is like the most important thing lol
It'll happen naturally over time as you draw more anyways, but if you can proactively look for places in your work flow to increase your speed or efficiency, that helps a toooon for time management. The time you save can either be spent for more work like jcmraz said (which is a good thing, imo), OOOOOR you can take the saved time and apply it towards other things. It depends on your goals as a creator 
Over the 1 year and some months that my initial comic ran, I went from barely being able to do a full color page in a week, to being able to draw 2 or 3 pages in a single week if I went hard and worked in batches (i.e. doing all the sketches first, then the inking, then the coloring- for most people this is slightly more time efficient than doing 1 page start to finish at a time. The time savings per page isn't huge but it adds up over time), to wanting to spend more time doing other things during my weeks, and so busting out my full pages in 2 or 3 afternoons/ weekend days and using the time I got back on other hobbies and socializing. Here's to hoping when I hop into the next project it takes fewer than 14 months if I focus xD
take a step back every so often to make sure you're maintaining a good work-life balance after you get your routine going
So this is where I'm at now. I realized that during the run of my comic, I had kinda let my work-life balance get out of whack. My day job was fine, I got into the rhythm with the comics thing, was making sure to maintain time for my friends... but I totally lost sight of what little fitness routine I had prior lol. I like to try and get to the gym a few times a week just to stay in okay shape but I realized I've barely gone at all like... most of 2019. Yikes! So that's something that I'm going to be working to reestablish before I get into another comic project. Hopefully cement it so it doesn't just crumble again xD
I'm also going to try a different publishing strategy this time- instead of working week-to-week and publishing as I go (buffer or not), I'm going to complete the whole season up front and then begin to publish, I think. The stress of self-imposed weekly deadlines is something that I realized I really don't want or need when i'm not being paid for the work, and it also led me to rushing a number of pages or panels to finish on time instead of refining them to be of a better quality. So I'll see how this goes haha. On one hand it means the folks who read the first chunk will have to wait longer for more than if I just started publishing after finishing the first few pages, but I'm hoping that it'll be worth the wait >;D
That's all I've got. Year 1 was pretty good, but hopefully I get better at this year 2 as well 
