GTM,
Just this week, we did the same thing..set up an account with my son - starting with $500 he earned from mowing lawns this summer.
It will be a little slow at first, because I want him to be involved in the buying decision and he is in school most of the day..but we are looking for 1 or 2 stocks from Chart that fits our budget. Maybe something in the .20 to $2 range ....
YMI is one we are talking about, LTS, RNN, those are the 3 that I have shared with him. Later today or tomorrow - he gets to place his first trade. If one of these move before we act....so be it. The goal for me is to teach him - that YOU MUST save/invest and patience will win over time.
Best wishes with your goals!