do i just pick some random weights[/quote]
Whichever plan you go with, you don’t need “random” weights. You know what you were capable of not all that long ago, so refamiliarize yourself with the movements and recondition yourself, and then work up to 75-80ish% of those (like you did with your squat) over the next few weeks and see how they feel. Strength should bounce back quick enough once you get back into consistent lifting again.
Did your bodyweight change, either up or down, in these four months? That’ll be a factor as well, in terms of regaining strength.