Afl(Aussie Rules)advice/tips towards how to play good as a midfielder?

gday folks! im 16 bottom age in 18s i came of a shocker last week but im ready for tmzs game im just asking how to i play good coz i play ruck rover for my team and im just wondering how can i read the ball well in the centre bounces and ball ups im just curious:)2nd is how do i motivate myself to go that extra bit when im buggered coz i seem to just not do it,like im fit and fast just get slack:(and is this a good idea monday i did some fitness and goal kicking work.wednesday did sprint work at the track and thursday had footy training 3rds and seniors and i had a lil kick tonite and had tea tonite is that good preperation??thankss xxxxx