Newbie question

No you should be fine. Some people like to start their plants in something with less nutrients in it. But Ive been using it for years with no issues. Some key things though, is don't feed for about a month. There's enough in there for the plants for at minimum a month but don't get comfortable because it will drop off pretty dramatically around that same time. So if you're using organics and dry amendments, id start around week 3 ish so they have them ready. Since they're autos, you may get away with not needing to feed for veg and just start feeding flowering nutes since autos flower around 3 -5 weeks.

Nope, you don’t have to add anything. Use it as is from the bag. You should see the little white perlite chunks in there