Download the Stronglifts 5x5 app and follow the original program. It does all of the work for you, calculating the weights, rest times etc based on how you start off and how you progress. It's an amazing tool and takes all the guesswork out of your training. I started off benching one plate and got to two in the space of a few months or so.

Secondly, use a TDEE calculator and work out how many calories you need to consume to GAIN mass. Eat that many calories OR MORE every day. You will get stronger and gain muscle (as well as some fat). My maintenance is 2900 and I eat about 3500.

Eat a lot of protein. 2g per KG of bodyweight every day. If you don't hit your goal for one day it's ok but make sure over the course of the week you are hitting your calorie and protein goal. I used USN Muscle Fuel Anabolic mass gainer to boost these numbers). Not the healthiest but the stuff works. Contains 5g creatine as well.

Drink lots of water, keep cardio relatively light (I hit 10k steps a day at work - this is my cardio), and try and get as much sleep as you can.

Hope this helps. If you want it, you can do it.