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How many you should plant really depends on how many you eat and how much space you have to grow them. I would work out how many you can plant and work on that basis. Maincrop ones store well for use through the winter.All potatoes can be planted out at the same time. First earlies, such as Swift, will be ready in about 12 weeks whilst maincrop varieties, such as Rooster, won't be ready until September.I'd certainly grow more Charlottes as I really like them, and they do store well. There's lots of good information on this website - http://www.jbaseedpotatoes.co.uk/index.php?route=common/home