From an ex-gymcel:
Start from the bottom and work your way up, start to lift lighter weights at first until you get the hang of it. You need to know how to do the workouts correctly first before going on to lift heavy shit. You will get mogged at first, but that's because you just started lifting. Work out for about an hour to an hour and a half at least three to four times a week. Don't skip leg day. Not too sure on the ideal kind of "day" for lifting is, as I did literally every type of machine at the gym every single day when I worked out, though most people would consider that to be very excessive. I also did 4 sets with 12 reps on each set on each machine, also not sure if that's ideal but I got jacked that way.
Have a good diet regimen for when you work out. Don't eat at a deficit if you're just trying to gain muscle. Eat metric fuck tons of protein and a good amount of carbs. Stay away from excess fats and excess sugars, but you still need at least a bit of both to fully maintain yourself. Drink protein drinks, but drink ones that are natural and don't have shit tons of weird chemicals in them.
If you're prone to eating snacks, stay away from soda and candy, but dark chocolate (yet again, without the weird ass chemicals) is good. Chips are fine, as long as they also don't have weird chemicals, and you don't eat too much of them.
Good luck. I hope this will at least slightly help you in your future endeavors. I'm an ugly, ethnic sand nigger with shitty features and I lived in one of the shallowest places in the States, so lifting really didn't do much for me in terms of getting girls.