One possibility is to wait a bit, get Age verified and then go through the classifieds regularly. Most guys there are open to negotiation (not low-balling mind you) and you can come away with a pretty decent deal. To boot, some of them are being sold with magazines and you can save some money there as well.
Also, hold off buying tac gear for a little while until you've cemented what you want to do and seen and explored your options.
In the mean time, consider hitting the gym, running a bit (unless you're already doing so) and it'll make probably make the first game a little more enjoyable.