Benching/Deadlifting but not squatting other general q's

[godofgamblers]

I've been working out on and off for maybe a year now, but nothing serious as I usually go with roomates, and working out primarily is social as well as a want to get muscle, get ripped etc. Of course it'd be nice to get pretty cut and lose all the fat, but I'm not very serious about it. I don't mind eating a lot of unhealthy foods or binge drinking, but I guess whenever possible, I'd like to do the healthiest alternative. Pretty much a casual gym-goer. I'll try to get my daily intake of proteins, eat the less fatty foods, but I'm definitely going to miss a few days and eat the greasiest stuff imaginable sometimes. This is just a little background/my perspective on how I'm going to approach this lifting thing, and I apologize if my attitude is going to offend a bunch of you since I'm not serious, but I just want to get the best possible advice with the "restrictions" that I have.

So I'm 5'8 160, and don't know my % bodyfat, but I know I want to reduce it, but the more important part I guess is to gain muscle without bulking up too much, say 5-10 pounds. I have a bench with dumbbells and the barbell at home, and that's pretty much it. I wanted to follow the 5x5 deadlift,squat,bench thing, but there is no way I could squat at home, so I'll just be cutting it out. I'd like to know how detrimental this would be to the program, and I udnerstand it would be a huge thing. (is there anything I can substitute for it?) Also, would anyone be able to tell me what a 165 bench would correlate to for dumbbell presses? My bar only goes up to like 155 so I'd have to switch to dumbbell presses to go higher. Yes, I'm under a lot of restrictions and could just go to a gym, and just might when I get more serious later in the summer, but I'm just hoping to optimize with what I have right now.