workout routine help

Google Rippetoes Starting strength program. You will gain size and strength in that.

It’s compound lifts (deadlift, bench press, squat).

but if you don’t have weights or access to gym equipment you can still do calisthenics like air squats, pushups, pullups, sit-ups, etc.

 

If you can’t do compound lifts since you just have dumbbells. I would consider working multiple muscle groups st the time, ideally in some kind of super set fashion. For example do dumbbell bench presses with dumbbell skull crushers.
Since you can’t do compound lifts work multiple muscles very close together. Even consider body weight exercises, like pushups or bench dips. If you have access to a pull up bar and something to lift your legs you can get your whole back too. If you need specifics just message me.