Well, if I recall correctly.... I did 3 sets of each. I had to adjust to about 30 pounds on the biceps to get up to 13 reps or so. by the time I hit the 3rd set, I had to go with 20 pounds and it was a big struggle at the end. Bear in mind, I’m new at the weights thing, so the weights aren't big ones yet.
On the triceps, I started at 40, but had to adjust up to 60 to hit failure on the 2nd and 3rd sets at about 12 to 15 reps.
To get an idea of the triceps machine, put your arms straight out in front of you. Make fists with your hands with your palm facing each other, as if you are gripping a pair of handles sticking straight up. That is your fully extended position on the machine, give or take a few degrees of movement. Now, pivoting at the elbow, bring your fist up and towards your head so your fists are right by your temples. This is the position your start in on the machine, gripping a pair of handles just the way you are holding your fists. I hope that helps answer those questions.
I don’t even know if this is a big deal, but I know so little about working out, I just have no idea and was curious about that difference in strength. Wondering if I should train my biceps more until they catch up, then train equally... LOL! hell if I know... I'm sure I should be using things other than the "isolation?" machines, but I'm new and they are an easy place for me to start my weight training.