There should be a guide on the bag of food you've got, usually they are generous with the guides, obviously then you'd get through a bag of food that bit quicker and need to buy another one.
For a young pup, all the advice I have been given and what I did with my two, is to concentrate on the basics, recall being the one you really need to get nailed. I was more successful with the second one, so I must have learnt a little bit of handling skills along the way, and I hope to be even more successful with the third, possibly fourth!
I always suggest a good book for beginners to training is one by a chap called John Weller, extremely knowledgeable about dogs, and training, the book is called 'A Simple Approach to Gundog Training' - don't let the gundog bit put you off, it concentrates on basic obedience, something every gundog needs, and a lot of pet owners want! And the profits from the book, which is only cheap in any case, go towards a rescue charity, so you can do a bit for a good cause too.
Hope that helps and good luck with your pup!