First off Tilly, welcome to the world of SLRs. It can be quite daunting but is infinitely FUN! You can get tons of good advise here on the forum, but my first suggestion would be to go to your local library and check out a couple of general photography books. Since it's an older camera, it won't matter if they are old books. Just make sure they discuss the care and feeding of a 35mm film camera.
You may also want to look online for a digital copy of the manual for the P30. I'm sure there's one out there somewhere, and if not maybe someone here can help you with one.
Also, welcome to Pentax Forums!
Mike