I understand you, because when I started betting on sports, I always had problems with finding information, and often I relied solely on my luck when I made a bet. Now I always look, for example, NBA predictions on Dimers, and often it was very useful to me, and I was able to earn more and get better results.
When I was just starting betting on sports, I did a lot of research finding handy sites. If you want to find a reliable site where you can bet on sports, then visit The Parlay Kings. This site is quite popular and a lot of people bet in them, also you can get bonuses such as sign up bonus and no deposit bonus. It is my go to bookmaker site by the way.