Whey is the liquid part of milk after they made cheese. It came about alongside our other many interesting food items in the 70s due to the food crisis. Protein is meat, beans, that general texture. Officially, it's amino acids rolled up together. Don't just assume you need whey. You need protein for life in general as well as the gym. But I heard one guy planning to stop eating all meat (protein) and then drinking protein shakes. That is mind-blowingly silly.
My biggest advice is work your mind as much as your body. I see so many people wasting their time and money at the gym. They do a total of 10 reps in an hour, playing with their phones the whole time. Even worse is the girls who never use more than 5 pounds weights for anything. She weighs 400lbs and can squat that much, but I see her using 5lb dumbbells. I see them rowing (back and thighs i.e., big power, enough to move a 500 lb boat) with 15 lbs.
There's some other pages you can google at will which talk about sets and reps, and everything else you need to know. Books still exist too, btw. Quick story; on the first day of ballet class, every time someone shows up to adult rec classes in a full, formal leo and bun. Either they did it as kids or googled "what do you wear to ballet" and worked hard to fit in and show off all the fixin's that qualify them. Don't do that. Don't try to have the best protein shakes ever in $150 magical pants with wraps and weight belts galore. It's kinda like eating zero calorie food.
Your first test is to figure out why zero calorie food is an oxymoron.