Zinn and the Art of Road Bike Maintenance is a very good resource - you can't beat the exploded drawings and he covers most types of maintenance, installation and repair for several eras. Park Tool's Big Blue Book of Bicycle Repair is also quite good.
And, of course, there's Sheldon Brown's website and this forum if you need further guidance. It wouldn't hurt to post some information about the fork and frame you bought - there are many people here who will help you get started. If it's an older bike - pre-1990 - try the Classic & Vintage forum, they have lots of experience and love sharing it.
I think, also, that it would be worthwhile going to a thrift store, buying a crappy old bike for 15$, taking it apart, cleaning/repacking etc., and putting it back together again, so you know what you're doing when you 're ready to build up a bike you care about.
All 4 of these sources are very good. The articles by Sheldon Brown also contain a lot of historical and "why is it done that way" information. Try to figure out what equipment your bike has, stem size, hub length over the lock nuts etc. Then you will be able to look for proper replacements or upgrades.