I want to be in a triathalon

I want to be in a triathalon. A triathalon is three sports. Swimming,biking and running in that order. I'm not much of a runner. I can't run that long a distance without walking a little. I still need to learn how to swim ... well, in deep water. The  deepest water I can swim in is 3ft 9in. I need to train really hard to make my goal. To train on biking I need to pump my tires but my dad needs to get a new air pump. I know that if i train hard enough I can make my goal. I can do anything!!!!!!!!!!!!!!!!!!!!!!!!!!!!!