You're welcome, Dan,
I suck at chin ups, so I do them first. However, I split up my upper body work, and I'm doing chest work on a different day. My priority is chest over lats, so if I were doing it all in one day, I'd do my chest work first, so as to put my best effort there.
General rule of thumb is to do the large, compound exercises first--the ones that use alot of major muscle groups, so they can help each other--and then move towards the isolation exercises. If you did, say, biceps work first, you'd be prioritizing biceps, but you'd fatigue them too quickly by the time you got to your bench press. So chins first might tire you out too much to do bench presses. You can experiment with order.
If you're doing one upper body day, and trying to hit as much as you can in one session, then just pick one tricep and one bicep exercise per session. You could do skullcrushers one day, and then the next upper body day do tricep extensions. That variety keeps things interesting.
RDL's are a completely different move than regular deadlifts. Deads are the king....they hit your whole back side, from the upper back down to your heels. If I had to pick only 4 exercises to do, they'd be squat, bench, row, dead.
Now, RDL's have big value, too, IMO. They hit the hammies in a more specific way (my butt is always sore after deads, not my hammies). Go to
www.exrx.net and look at the specific exercises. They have a video for the stiff-legged deadlift (aka straight-legged deadlift). The RDL is done just like it, EXCEPT you have more of a bend in the knees. Lean down as far as you can go, while still keeping your back tight.
If you go over to bodyrecomposition dot com, in the exercise technique forum, there's a thread about RDL's, and a great little video and description. That site (bodyrecomp), BTW, is awesome.