I am a completly disorganized mess at the gym, and I could use a little help getting my act together.

I go to a 24 Hour that's literally across the street from work for me, so I get there 4 times a week. That's not a problem.

I'm in relatively good shape, and usually stretch and then do 30 min or so of pretty good cario. I vary the machines I use to keep from being bored. I do the cardio because it's good for me and, aside from wanting to keep in good shape, I'm trying to avoid the CV disease so rampant in my family.

Here's the deal--when I'm done with the cario portion, I get to do what I love, love, love--which is to lift. I know about alternating upper and lower body on different days, but I have a really hard time, say, on a upper body day, doing things in the correct order. I've heard that one start go shoulders, then back, then arms last, and I've also heard it doesn't matter.

Lower body the same thing--all different theories. money is really tight so I can't afford a trainer, and the ones at my gym are a pretty hardass salespeople. it's not like I could just do it here or there.

Any recommendations for how to do my favorite part of the workout more efficiently?

Thanks for any help in advance--Jen