I need some warm up exercises for my singing please!!

find a piano/keyboard, sit down (sit straight) then play keys and hit those notes. Start and middle C. then work your way up, and do each note over and over till u hit it perfectly. go as high as u can. then go back to middle c, and work your way down the same way. i used to only hit so high and so low, but now i can go 2 octaves above middle c and one and half ovtaves below :)also, this works your throat and helps your vocal coards remember the right notes to hit. hope this helps! :D