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I do a thing called Progressive overload. It's a routine that gradually increases mechanical tension of the muscles, it focuses on building strength which is linked with greater muscle mass. The simple version of that is it's low reps, low sets, and high weight. (If you're looking to just get toned you should probably look into a routine that focuses on cellular breakdown or high reps, high sets and low weight)
Typically, I go for 3 sets of 6 reps, but you can do anywhere from 6-8 reps on this routine but I'd suggest sticking with only 3 sets
It works by increasing the weight each time you're able to complete a set, say if you started on a 75 lb bench press and you were able to complete a full 6 reps with good form you'd then add 10 lbs for your next set, do this until you either complete all the sets or reach failure. If you hit failure and arent able to complete 6 reps of (say for example 105 lb bench) you decrease the weight by 5 lbs and attempt to complete 3 clean sets of that weight (So you'd do 100lbs for 3 clean sets). Then attempt the weight you failed at once you can.