So hold off on doing straight-leg deadlifts unless I can find someone to show me proper form?
Straight-legged deadlifts can really screw up your lower back if you do them wrong. Try following the directions on that site, and if it feels ok then go with it. For me my lower back is already kind of messed up, so I'm not going to do them until January when a serious weightlifting friend of mine gets back to campus and can show me the right way to do it.
Ok, so I should build mass for 3-4 months and then go into a "cut" cycle for a few months to trim fat? And for gains, low reps at a heavier weight? How do I know what weights I should start at ? Trial and error? use enough weight so that I "fail" on my 8th rep?
That sounds like a good plan. Here is what I did. Before this summer I had never lifted a weight in my life. I was 6'1" and 145 lbs. I started out getting a membership at my YMCA at home as soon as class let out for the summer. For May, June, and July I just did legs and abdomen on TUTH and arms and chest/back on WF. I did everything on machines because I was too much of a wimp to just go straight into the free weight section. I took August off because of a vacation, getting back to school, etc. I was about 157 lbs when I stopped in August. Since September I've been working out 3-4 days a week doing a similar workout to what I did over the summer, but almost entirely with free weights. Machines are bad. Only use them when starting out like I did, and for stuff you have no way to do with free weights (like leg press). I'm going to keep my schedule up until Christmas. Right now I'm 163 lbs and I'm hoping I can get near 168 by Christmas. Sure I have more fat than I used to (which was none), but it'll go away soon enough. Then when I get back here in January I'm completely changing everything up. That friend of mine is coming back to campus and I'm getting real serious with the lifting. I'll be going 5 days a week with chest on Monday, legs/abdomen on Tuesday, back on Wednesday, legs/abdomen on Thursday, and arms on Friday. I don't think I'll be able to make it because I'm a hard gainer, but 180 lbs by May would be incredible. Then I'm going to do a cut cycle for the entire summer. I love biking, so I'm going to try to get out for multiple long (2+ hr) rides each week along with running and other cardio.
For gaining you want low reps at high weights. I do 3x6 (3 sets of 6) for most of my exercises, and 3x5 on squats and leg press. You want a weight that will give you failure near the end of your last set. As soon as you can do all 3x6, up the weight for the last set. Then once you can do that up the middle set too. For example once you can do 30, 30, 30 lbs for hammer curls, go to 30, 30, 35 lbs. Then 30, 35, 35 lbs. The tricky part is exercises you can't really go to failure on (squats, bench press without a spotter, etc.) For those you just have to use your judgement.
When I do my cut cycle over the summer I'm probably going to go to 3x10 lifting. Higher reps at lower weights gets the muscle to tone more than increase in size.
I should add to concentrate on doing compound exercises such as bench press, horizontal and vertical rows, pulldowns, squats, etc. for mass gaining. Limit what you do isolation exercises for until you get into serious stuff like I'll be doing in the spring. Like only do one or two kinds of bicep curls for now. That muscle gets enough work doing all of your rows and pulldowns.