No its not that hard if as you are doing commit to the research first.
My advice get a good book Traditional Pig Keeping by Carol Harris is a good place to start or the National Trust little pink book of pig keeping by Richard Lutwyche. Second hand books on Amazon are reasonable price. if you can't afford the book you can't afford to keep pigs, its not a cheap hobby but you do get good meat as the reward.
Also check out the DEFRA website if you are in England SERAD if in Scotland.
Go on a pig keeping day course or track down a nearby pig keeper who'll be happy to talk to you for free (i'm in North Yorkshire if thats nay use)
Forums are useful but there is a lot of misinformation as well as good information as everyone interprets rules to suit and what works for one pig keeper may not work for another.
To answer your questionsFirst you need a CPH number from your local DEFRA/SERAD office then a herd number from your local Animal Health office all contact info from relevant govt offices websites.
Yes you can sell the meat from animals living in woodland
If they're for the freezer we usually recommend you buy weaners already wormed by the breeder so you don't need to do any further jabs.
Don't keep males & females together buy a couple of one gender so no taint problem, suggest for first time you get two boys and take to butchers at approx 24wks no later than 28wks that way you can see if you like pig keeping and it likes you.
hth
mandy