Well Sano, Sinister are and many more are more competent than me in S and C.
Here are my 2 cents.
In BB and Powerlifting there is a core lifting based on the 5x5 program which is basically do Squat, Bench, Rows 3 times per week and add once per week DL. All that for 5 reps x 5 sets with a heavier weight every time. And then all the variables start based on goals, how many times per week you can train, fatigue management and etc. Everything is really individual and you either need to learn your body or hire a coach to measure your strengths and weaknesses.
Here is how the standard Strenght program will go - measure your 1 RM maxes for lifts like Squat, Bench and DL.
Week 1 - lift 5x5 at 85%
week 2 - lift 5x5 at 90%
week 3 lift - 3x5 at 95%
week 4 deload - lift at 65-75 % with slightly more reps and perhaps less sets for example 3x8 or 4x6
repeat weeks 1,2,3,4 after measure new 1 max RPs - repeat again 8 weeks or change slightly exercise.
Main lifts are squat, bench, ohp, row, DL however dips and chin up are great too.
And then depending on how often you want to lift and how often you want to be boxing. Keep in mind both sports are very taxing to the CNS and do not combine well in the long term. So I would advice doing less lifting.