Nope, no dumb questions here, but sometimes you'll run across some dumb answers LOL!
There will be directions on the side of the bottles. It'll show you a feed chart, which shows you the amount to add/gallon of water, and how much at each stage of the plant's life. Start a little light to see how your plants react. Different strains require different amounts, and no feed chart can determine exactly how much you should be adding. But you can tell by what your plants' leaves are showing. The GrowWeedEasy site has a really good problem guide which can really help you figure out what's going on.
You'll want to have a teaspoon and tablespoon, or you can get plastic medicine droppers, like for babies. Super cheap and available everywhere.