I've done a decent amount of work on my Kimber, and I took a beat-up on Norinco (probably similar to your Rock Island) and completely reworked it into a halfway decent combat/competition gun. It is still a work in progress, but its a far sight better than what I started with.
Sader762 let me try everything out, on my Norinco learned from my successes and mistakes, and did a similar rebuild on his Springfield MilSpec.
I wish I could point you to a simple online resource that has everything you need to know in one place, but I haven't found that yet. I got most of my learnin' online, but it was incremental. I just did one thing at a time, over a long period of time.
I would offer to have you over some afternoon to rebuild your pistol, but it's not that simple. Sometimes what you think will be a simple replacement ends up taking longer than you think, and hours turn into days.
I'm not trying to discourage you from taking this project on. It is one of the most personally rewarding things I've ever undertaken. Just don't expect it to be completed to your satisfaction in an afternoon. And once you replace the hammer, trigger, and sear, you'll want new sights. Then you'll want a new bushing to increase accuraccy. And then, and then...
I'll copy this reply into an email, since you said you can't always check the forum.