It depends how many BW chins / dips you can do (i.e. how strong you are), and also how many times per week you’re doing these lifts.
Just doing 3 sets of AMRAP (as many reps as possible) with bodyweight, going close to failure but not actually failing mid-rep, works well for beginners.
Alternatively, you could do 3-6 sets at bodyweight below failure over the course of the workout, the goal being to accumulate volume (e.g. if you can odo 12 good pullups, you could do 6 sets of 6-8 reps). Or add weight and try to do sets across – e.g. add 10lbs and do 3x5 or 5x5, then add 5 lbs next workout and keep reps constant. Or ramp up to a top all out weighted set – e.g. BWx6, +25x6, +45x6, +60xAMAP.
You can also cycle through these various approaches over the course of multiple workouts.[/quote]
I workout out 3 times a week but do dips, pull ups/chins once or twice a week…so when should i start adding weight?[/quote]
Go by feel man, but if you can do at least 15 reps of bodyweight Chins per set then add some weight if you want. I’m a big fan of doing rest-pause type sets with weighted chins, where you go to fail with weight, then immediatelt go to fail with bodyweight