Collection wise most older recipes you will have to buy or use a second character to farm with the skill at whatever level you desire recipes for. Traitors vault use to be a good place to get recipes until some nice player thought they should share how good it was with the world including the devs who nerfed it so bad its terrible for recipes now.

The best way to get recipes yourself is to steal them and stealing is much easier if you have the blade of woe and the passives from thieves guild but are still doable without. The best starter area for thievery, IMO, is the second floor of the building that the banker is in in Mistral. Start at the staircase and work to bedroom then work back. The NPCs are easy to avoid and no guards.

Wayrest Castle is another good place for stealing. If you are good you can steal right under the king''s nose. Abahs landing has several good places in which you can make a route out of. The fighters and mages guild are pretty decent there as well as one of the shops upstairs. and the Gold coast trading company in Anvil.

All of those will yield you recipes regularly. Remember you dont need to launder a recipe or print to learn it and i would learn them right away if you want to know them in case you have a run in with the guards.

You can buy the green recipes from chef or brewer at or around your local inn. The recipes go up according to your crafting level so you can make sure to get the complete collection.

You can also check traders.