Wirralman's advice is spot on IMO, neither discipline is hard but combining the two can be tricky. As he and RAW said, get your basics right and it will make life a lot easier.
I've always got my pups out as much as possible from the off, (see Fuji's brilliant posts for that!) and when my dogs really start to take an interest in the chase its time to hold em back from it, hang on a month or two and then start 'em on the lamp. I've never allowed my pups to run sommat, unless by accident before I start night work. Play, mooch, learn as puppy's but never allow to really 'try'.
Only and I do mea