Simple Powerlifting?

Hope you can help me, i train at home in a low ceiling cellar with squat stands, bench and a platform with a bar and weights (db handles too)

I’m wanting to move into powerlifting after a long stint in bodybuilding which led to alot of cranky joints from overuse which means overhead work is out and heavy direct tricep isolation work (ulnar nerve issue) so I wanted to dip my toe into powerlifting.

Just abit of background, I train abbreviated, so I tend to focus on the meat and potatoes, so adding in auxiliary lifts with the basics is new territory for me which is why I’m asking if they are good for the lifts in question?

Or would focusing on the 3 lifts only, kinda like a one lift a day routine but for the big 3 lifts be alot better for someone new to PL?