hey!
Welcome to Wattpad!
If you ever need help with anything, feel free to let me know, I'd be more than happy to help you out with whatever I can. Also, you might find answers to some of your questions here: http://www.wattpad.com/user/Writing-101
Wattpad has a support page which you can find at http://support.wattpad.com/home, there you can look for solved questions and/or make suggestions to improve Wattpad.
If you're looking for new stories, well the Discovery tab will help you out with that. Or you can also use the Wattpad Shuffle which you can find in the right hand corner of the page.
To promote stories, get suggestions on what to read and to make new friends you should pay a visit to one of the many Wattpad Clubs. I'm sure you'll find what you're looking for. There’s one club solely for the promotion of stories and maybe the Newcomers Club can be great for you to get to know new people.
So yeah, have fun on Wattpad!
~Vicky