Match shooters are generally a gregarious bunch of guys who will go out of their way to help you in any way they possibly can. Use whatever you have, admit that you need help, and it will be there for you.
If you decide to shoot in a league, keep your eyes and ears open for some truly great deals on used rifles. As shooters get better, they usually will upgrade to better equipment, which leaves the oportunity for you to do the same. The unfortunate reality is that being truly competitive in highpower costs money.
You can have a ball using whatever you have. If you have no desire to win matches there is no need to upgrade to anything else. If winning matches is your ultimate goal, be prepared to spend a bunch of cash. Match rifles COST.