There's not that much to learn. Give it a good environment, plenty of light, and don't overfeed. If you do those things you shouldn't have any issues. Many issues are caused by overfeeding and then the first thing many do is add even more stuff. Overfeeding can cause nutrient antagonism and deficiencies. Feeding more isn't always the answer and can make things worse. Keep things simple and you'll have a decent grow.
For now the main thing you should be doing is taking care of the bugs. You can use neem oil or that stuff you posted. You'll want to spray every three days about 4 times total. Don't mix stronger than the directions thinking the stronger the better. You'll end up frying your plants.
Good luck.