Firstly, word of mouth works great! Tell people that you just became a graphic designer and would like to practice doing small jobs…
Second, does your community have free classifieds. Put your name in there and write that you do small graphic jobs for a minimal price (or even for free if you want the experience and not the money.)
Additionally, when you do get an opportunity to do small projects, ask your “customer” if they let you put your name on their design. This will also build up your name and then hopefully people will recognize your name when You do freelance as your main job!
Hatzlach!!