You need to make sure you're in a 250-500 calorie surplus. The leaner/skinnier you are, the closer your surplus should be to 500, but use 250 to start with. To estimate how many calories you should be eating, multiply your body weight by 15 and add 250.
A full body split LP routine is the most efficient way to get your neuromuscular strength gains. It will probably take you 3-6 months for you to plateau on this, and you probably won't build much if any muscle, but you need to get this baseline of strength down and learn the movement patterns before you move on to an early intermediate program actually meant to build size and strength. I recommend Greyskull LP with arms plugin.
You want anywhere from 0.8-1.2 grams of protein per pound of body weight. Each gram of protein contains 4 calories, so if you're eating 100 grams of protein per day, that's 400 calories. The rest of your calories can be filled with carbs or fats, but carbs are preferable as they'll give you the muscle glycogen you need for quick explosive movements, and they're less readily stored as fat.
That's really it. Muscle-building isn't rocket science, it just takes a lot of time and commitment. If you eat too much and get too fat, you'll want to switch to a 500-1000 calorie deficit to cut off the fat. Don't expect to gain much if any muscle or strength while doing this. It is very common to lose muscle and strength while losing fat.
