Like a lot of these guys said. When i first started out I found the simplest way to shoot the stage. As time progressed and i learned the game it became a LOT easier.
Once you have YOUR stage plane, don't change it after your walk through. Just go shoot your plan and make sure you do it the way you planned. As you progress you'll start seeing ways to shoot it to better game it.
Next, when i shoot a stage i start by clustering the targets by shooting positions, i then will remember them by round count. Such as on a 32rd stage i'll shoot 8 from A (reload), 4 from B, 4 from C (reload,) 6 from C (reload), 8 from D, 2 from E.
Starting out. don't over think it. Get your hits from where you know you can get them. The rest will come with experience.
Oh and don't be afraid to chat up fellow shooters and ask them questions. One thing I learned about this sport is that seasoned shooters LOVE to help out new people. Just be courtious and let them walk the stage (while you follow them) and get their stage plane then ask them for tips or if they would mind showing you their plan. *this is for Level 1 matches lol*