I don't vaccinate mine - although the ex battery hens will already have been done at the farms.
I sell the eggs, basically to pay for the feed, at the farm gate. If you want to sell in shops, farmers markets etc. you would have to be DEFRA registered for your poultry, and then you go into the issues of grading(sizing) eggs etc. etc. As to making a profit, well, I am not sure I do, to be honest, probably break even. When the cost of feeding, and bedding, egg boxes and things are taken into consideration, not adding in the man hours looking to the hens, I would have to put a big price on the eggs.