Shoot for 1.5 kg weight gain per month. Do it until you’re at 80-85 kg then cut for 3-4 weeks and around 2 kg. Then bulk again 5 kg. Look at your lifts, if they are going up, you are doing good. If you train and bulk the majority of it will be muscle if you do it relatively slowly with the rate I said, a lot of it will be muscle. I wouldn’t stop until you squat at least 250 lbs or 110 kg for 5.
You sound like a type 2b or 3 like me and the best tip I can give you is don’t stress too much about this shit. Eat enough too gain weight, protein intake 1-1.2 g per pound of body weight, drink liquids with a good amount of calories. Sleep enough. Train so you can recover. Don’t overdo it. Try a minimalistic approach (3-4 exercises with one compound lift a day with 3-4 training days, 1 h in the gym) maybe and implement the tip CT gave you. That’s it