I got some free weights and have started lifting again. Which of these routines is better...

Tuesday: chest / triceps
Thursday: biceps / back
Saturday: shoulders / legs

I guess in theory it's supposedly better to train biceps and back on the same day, but I found that back workouts were extremely difficult after frying my biceps. Would this routine be as effectice?

Wednesday: chest / back
Thursday: shoulders
Saturday: biceps / triceps
Sunday: legs

My biggest focus is abs right now. How often and what days could I add some ab workouts?

anybody?------

Chest/biceps - forearms
Back/Triceps - abs
Shoulders/legs - forearms
x
twice a week.
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Abs are like any other muscle. Do them on alternate days. Chest and Back are large muscle groups. Not advisable to hit them on the same day.
Chest exercises hit the triceps and shoulder also. Thats why I have suggested Chest/Biceps.
Similarly Back exercises hit the biceps. So I've suggested Back/Triceps.
Shoulders and Legs are relatively unrelated muscle groups. So you can hit these together or split them up (Legs require lot of energy to get a good workout). Don't forget forearms/calves.

Since you're asking this question, I assume you are new to the whole weight lifting thing? If so, then go with a full body workout, upper lower or push pull routine and scrap the body part split.

Or if you dont want the FBW and do choose a split like me i do:

Chest/Triceps/Abs
Upper legs/Back/Biceps
Shoulders/Calves/Hamstrings

But thats not fixed, i mix it up a bit, train 4 times a week, i will make sure i do my upper legs twice a week and i will do one of my upper muscle splits twice a week (which changes each week). I also try fit abs in at least twice a week. Thats mine anyway

Thanks. I should be able to come up with something out of this. Just curious though, would training my back on Monday and my biceps on Tuesday be overtraining?

No. I can't think of any exercise that works the back and secondarily the biceps.

Wouldnt it make more sense to hit the back before the little biceps. How long have you been lifting?

What about bent-over barbell rows or one arm dumbell rows?

That makes sense. I'll give it a try. I lifted (poorly) last winter and am getting back into it now with hopefully a better routine and better results.