Your piercer will need to decide when the time is best to prove you with the piercing so talk to your piercer.
It is best to wait about 6-8 weeks like you would with any other piercing :)
It depends on the piercing.
2-3 months before the piercing can be submerged. You can go swimming now as long as the piercing doesnt get wet.
It takes 6-8 weeks for your frowny piercing to heal.
You wouldn't have been told to wait that long unless you needed to be told to wait that long. You need to let the piercing heal before you go changing the jewellery, if you change it too soon you can damage the fine tissue your body is trying to form to make the piercing. So wait till it's ready.
It is best to wait 1 month after getting any piercing to go tanning. Tanning affects the texture of your skin and virtually dries it out. With a fresh piercing, this can be highly irritating.
whenever u want
You can get it done again once you're sure the piercing is healed inside as well as out.
There are no limitations to what you can eat after a lip piercing.
I would wait at least 2 weeks just to be sure your body is healing the piercing OK before you start subjecting the piercings to chemicals.
Before you can change it out you should wait 3 to 5 days
2-3 months