You can give any brand of fresh, full cream milk - recommended brands are usually Farmhouse or Greenfield's :)
You can give it just the same as the amount of formula your LO is drinking - just by replacing formula feeds with fresh milk! In fact, milk after 1yo is just a supplement so you can cut down on it as you go :)
Serving it cold or warm is up to your comfort level, but you can put the bottle in a cup of warm water to warm the milk up - don't use a bottle warmer or boil the milk!
As for shelf life, they don't have a long shelf life as it's pasteurized and fresh (it's those you find at the chilled dairy section). But do note that each carton has to be finished within 3 days of opening :)
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