the first mile is always the hardest

Today was the start of my trying to train for a triathlon.  Im not the greatest runner ever, so I see this as a big step for me, im more of a swimmer. I took Saxon the dog with me, she kept me going faster than I normally would have run. My plan is to add a mile every week or so, till im up to 5... I think you only have to run 3...right? Lord help me.....i hate running.