I have box sets (5 books each) for The Human Chronicles Series and the REV Warrior Series. The first books in each series are only $0.99 if you don’t want to spring for the $9.99 box set price. Also, the books and bundles are in Kindle Unlimited, if you’re a member. Either series would be good to start with. I don’t know much about Wattpad, but when I read that some of their writers are making $1,000 a month — and they made a big deal out of it — I’m not sure how good it is if this is what you want to do for a living. Go indie (independent) publishing on Amazon. It’s easy and with no barriers to entry. And you make 70% of the sales price for books priced $2.99 to $9.99. Amazon is the largest, so you can’t go wrong.