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I would start by keeping a log. 3x12 is great. Keep doing it. Include a warm up set or 2 of 20 reps. If you can go up in weight, do it. If not. Try an extra rep. If you can get in a few extra reps, increase the weight marginally.
It'll seem like you're not progressing. But just keep at it. If you're new, you don't have to worry about plateaus yet. Progressing takes time. Gaining weight takes time.
If you're interested in body weight/ bone density, don't stress about always having to increase your weight on the bar.
ChainBreaker-
The initial warm-up set / sets? Is that the same weight?? I had been doing a single set of 12 with just the bar - 7ft Olympic.. which is about 13kg.. then adding 5kg, doing a set, then adding 10kg, doing a set, then adding 20kg and doing my 3 sets.. I'm only a wee fella LOL.. 65kg.. so not expecting massive weights or gains.. just hoping to try and be consistent.. and grow a bit and increase both my weight and also lifting weight..
Technics100
I'm sort of new to all this (44 year old male) and am trying to built up my upper body.. due to the fact I'm pretty skinny and also have osteoporosis and weight bearing exercises are good to increase bone mass. I have a bar with various weights, squat rack, bench, and pull-up bar..
What's the best way to increase my weights on benchpress and in general? doing 3 x 12 sets of a weight for a week, then just trying to jump up by 5Kg or adding more reps in?? or trying to go heavier with 5 x 5 or similar?? I seem to get stuck at the same weight range for all exercises..
Trying to up my protein and using shakes to do this daily..