Hi @Makarov! Welcome to Tapastic!
By posting comics! Keep your comic rolling, updating as frequently as you can manage, and just keep on trucking. Being active on the forums and promoting yourself on social media are both good too, but it all starts with posting comics.
It's very possible that those comics got featured in a Staff Pick or a Daily Snack, which always leads to a boost in views and subscribers, and it's also possible that those creators have a huge following on some other website (like Tumblr!), which followed them over here.
I'm afraid not! If you want to reorganise your comic, you're going to have to upload pages to existing episodes and then re-name them, rather than moving the existing episodes. Kinda like re-arranging a bookshelf by cutting pages out of books and putting them in each other's covers, instead of just moving the books.
Cumbersome, but there you have it!
Ad revenue income depends on how many people view your comic every month, and it's a slow climb to getting those numbers. For reference, this month I have 37 000 ad impressions (i.e: views from people who have their ad-block turned off), which translates into 18$ of ad revenue money. I get most of that money - Tapastic does take a cut, because hey, they need to keep this place running!
But like I said, it's a long slow climb to get there! The first couple of months I was signed on for Ad Rev, I made $3, and I already had a 600 or so subscribers.