Good starting point would be...
1. Our book
or...
2. Our course
www.oaklandspigs.co.ukBoth will tell you all you need to set up, and include costs, and what meat you get.
Ok - advert over!
Taking on weaners (typically 6-8 week old piglets "weaned" from their mother) through to pork is relatively easy, but you need to consider a few things, such as where to get them from (finding good breeders), how much to pay (varies from £30-£100 for weaners dependent on what you are buying and for what) , where to locate them (giving shade and shelter, as well as rooting ability), how much space to give them (space to eat inc. rooting, space to sleep, space to dung), fencing (typically stock and/or electric), housing (typically a pig ark, either bought or home made, but you can use budilings and brick built sheds), feeding (typically a pig "nut" plus extras that are legal to feed), water (both to drink and to wallow in), how to transport (collect in dog crate?, to slaughter in a legal trailer), where to find an abattoir and a good butcher, and know and keep records for the many regulations.
Now this may look a daunting list, but tackle each item, and plenty on here will tell you that it is both fun, and produces fantastic meat. Done right you can make a little money, or get your own meat free by selling enough to pay your costs with meat left for you.
Good luck !