if you plan out your story beforehand, its a lot easier. mainly because you dont spend loads of time stressing about where the fuck youre going. this can be as simple as bulletpointing your plot points (include how characters get from a to b to c or else youll stress again) or even writing out your whole story - its for your eyes only, so all you have to focus on is getting down your story, the emotions, maybe writing what you need to remember setting and detail. i find this really helps me, but you have to be careful to write while also thinking it through as a comic. but yeah, thats not necessary, what is necessary is planning your story.
then, thumbnail before making your pages - sketch them out, maybe multiple times, thinking about your lettering and arrangement. until youre happy with it - dont be afraid to take as long as you want figuring it out. if you have some friends that do comics, maybe show them your thumbnails and ask for advice.
also, before you start posting your comic, have a month's worth of pages ready, so you dont have to rush to get each page ready. it makes it way less stressful.
if you want to improve, theres lots of blogs and books about making comics, and similarly for art in general - also, look closely at comics you really like, and try to figure out what theyre doing, learn from their panelling and angles and lettering and try to emulate it. dont worry if youre not good enough for yourself yet, making a comic is the best way to get better at making comics.