For those sports you will be probably at least 50 or more feet away and will likely need a lens as others suggested 100mm to 200 mm or even 300 mm on the long end. The Canons are good choice and just need practice and some basic knowledge on settings for action photography. You can start with the fixed program settings. Go to your library and check out some free books or use google tons of hints on the internet! You will have a good time learning and will help you taking pictures the rest of your life. One suggestion no matter what you get get a UV filter for the lens which will help protect it from scratches and if you drop it might break the filter not the lens.
One quick trick to try with even your current camera if the action is moving parallel to you try “panning” the camera at same speed as the moving object. It can have sharp focus on the moving object and the background will be blurred.Im not pushing any vendor, but I have never had a problem with B&H.
http://www.wonderhowto.com/how-to-use-panning-capture-great-action-shots-with-movement-377596/