I'm a complete noob, only been here since May. But I'm a history major so I did what I do best and got some research done.
Here is what I've learned:
For tapas smaller once a week or twice a week updates are preferred. Because there are so many comics on this sight this gives you more visbility.
Color comics may be more popular but mine is black and white and seems to be doing fine
As for groups. There are some forums here with links to chat groups, however most creator groups are found outside of this website. I have joined a lot of groups on Facebook, such as Webcomic Underdogs, which I find helpful.
Once I hit a plateau in my subscription rate I used project wonderful for advertisement, and have not spent more than ten bucks in total for two ad campaigns. That is not that large of an investment and I can pinpoint gaining five new subscribers from that alone, but am not sure of the exact number so it may be more.
Now that I have some readers I am slowly going back to old episodes and fixing spelling mistakes with the help of my partner. That way new readers won't get turned off by my bad spelling and grammar that ironically gets corrected by a non native speaking person, lol.
Also keep in mind, if your comic isn't in color, you don't have to change that. If your comic has a few longer episodes and you change it to a shorter more frequent schedule, it's not a big deal. These where some of the hang ups I had. I use to post long chapter but know I post shorter ones more often, and my readers don't mind. Be open to change along with any new information you get. The more you do to better your comic, the more people will subscribe.
Good Luck!