You should work out your biceps two to three times a week, following a strength-training schedule and gradually working your way up to a greater number of sets and repetitions.

When should I train biceps?

Work your biceps up to three non-consecutive days per week. This means at least one rest day between bicep workouts. If lifting heavier weights (enough so that you can only complete six to eight repetitions), rest at least two days between bicep workouts.

Should I do biceps first or last?

Never Do Biceps Immediately Before Training Back

With some splits, pull-day muscles (biceps, back) are trained on the same day. Most likely, you arranged the order such that the larger muscle group is worked before the smaller one (back before biceps).