First of all welcome to the Cafe
I would suggest looking around and reading as many posts as possible. We have a lot of great minds here with a lot of great information. Also, don't be afraid to ask...most are very nice and helpful
For a first attempt, I think you did real good. My main concern would be your RBs...those are the life-line of fantasy football, for the most part you need good to decent RBs in order to compete, of course there are exceptions. I really like your QB and WRs. What are the requirements for defense? I don't think it will make or break your team.
If there is a team in need of WR, I would at targeting them to get a decent RB in return. Overall you should have a decent season and stay competitive