I think every one has different workflows and styles that works for them, so keep that in mind, but I will put my two cents in
I started typing this a bit ago this morning and started to redo some things for the tutorial I was working, and see Jeff added a question and Drew also added some things and as Drew indicated there are a few approaches.
1. What system do you use to label your tapes?
2. Do you capture the entire 40 minute average time from all 10 tapes? If so, do you dump the crap later in order to save drive space?
3. Is each dive trip a "project"
What's the best "go-to" resource for FCP for Dummies?
I label tapes with year, month, day, divesite(s) so 20090117_CoolReef and may jot a quick note on the case. I also just capture the tapes fully onto hard drives. Though Log & Capture is something many use, I am going to watch everything anyway at some point and with hard drives so inexpensive it works out fine. DV/HDV is 12-13 Gigs an hour (more if you are using AIC/ProRes), so you can get 50 hours+ on a 750 Gig hard drive with HDV/DV, less with the other codecs, but to me it is worthwhile just to do it that way. I make a general folder for each trip (200812_Mexico for instance) then capture each tape into seperate projects using the capture window to name the clips by filling in the fields with "20090117_CoolReef" then each clip captured (I have settings for new clips automatically generated) will have the name 20090117_CoolReef_1, 20090117_CoolReef_2 etc.
I will then drag all the clips onto the timeline and do a quick scrub through (or watch depending) to see what I have and do a rough edit. Meaning the real non-starters get tossed, but keep things that could work or are unique. I then copy that timeline and do a edit or two off that. One is a longer edit more for myself or others on the dive where I will leave shots in/make the segments a bit longer since I was on the dive, then a short edit.
Taking good notes of the shots is important, there are different ways of doing it, from a notebook, to dropping notes into final cut and software. Depending on the footage, you can even use iPhoto and keywords 
As to sites, apple.com, creative cow. Steve does articles for http://www.kenstone.net and that is a good resource. And of course Wetpixel. 
Do not let Final Cut get too daunting, it can do a million things but like many things 10% of the features will do 90% of the work. Get to know the video scopes and the three way color corrector. Will post something shortly for you, I have been meaning to do some tutorials on this but have not really gotten around to finalizing them. EDIT TO ADD: Still Not Really Final But Can Jump Start Things
@Jeff iMovie is fine for many things and I use it from time to time. Not sure which version of iMovie you are running, because depending on the version of Final Cut vs iMovie, Final Cut may or may not open it. Also the way iMovie captures things, there will be some rendering in Final Cut needed (not sure if this changed with the recent versions, have not used iMovie in awhile to capture, so take it with a grain of salt. )