Best exercise routine for a newbie?

I’m trying to become more healthy and take advantage of the beautiful work out facility on my campus that I’ve almost never used. When I go to a gym, I never know what to do because it’s too overwhelming. I want something relatively simple that I can easily stick to. I’m fairly slender, but I want more tone and thinner waist from the front (more of an hourglass shape because my waist doesn’t go “in” much on the sides). And a bigger butt wouldn’t hurt either lol I’m assuming I would need to do squats or something for that. Could someone please write out in detail a work out plan I could follow including particular machines or exercises and how many reps/sets? To help, (I’ve stated this in unrelated questions) I am 5’9” 127–131 lbs. Waist and hip measurements respectively: 27” and 36”