Kett, you getting to the Elite Four is never a breeze. However, it can be easier or harder depending on how you do it. The three Pokemon you have could get you to the Elite Four, if you raise them right. Just train a lot before entering a gym, and try and fight any trainers that you can.
((If you like Leaf Green a lot, I am working on a hack. it has the same events, but with different starters and maps.))