Guess it must depend on where you are as my meat is all slaughtered, butchered and sausaged at the abattoir and environmental health are more than happy with that. All I need to do is keep notes on fridge temps and cleaning schedules at home and that has required no inspection from EH. That is with it being PACKED at the butchery. If it comes home in bags and you have to repack it, the above does not apply and you will need what HH has said.
Trading standards where I am want: a £/kg, weight, a best before/freeze date and a discription of the product, any allergens, ingredients- in order of quantity (for sausages etc) and a way for the customer to contact you. We use our post code.
You really are best speaking to your own local TS and EHO, especially reg cooking hot food and selling fresh on the same stall, can be a bit of a mine field as you again need seperate washing facilities etc.
Good luck, it's very enjoyable speaking to people! Especially when you build up regular customers that come back time and again, just to buy your products. Downsides for me are: how up and down the markets can be. The waiting times to get into some markets as they do not want repitition (which is not a bad thing- but still frustrating) and how little you have left over when you take out your rearing costs, transport, slaughter, butchering, packaging, your time, rent, insurance and..you get the picture, times are hard for all of us, especially pigs.