bitcoins

Hello guys thanks for reading my post. Im kind new in all of this. We dedicate ourselves to sell electronic cigarettes and in our country is not law accepted. No one ever went to jail for selling this devices, actually law in here is a bit poor, but i really dont want to have ANY problem, so i...

I need to know what is the best bitcoin wallet to buy and sell bitcoins? Is there a way to avoid to use an exchange service? or must I have two wallets like I read blockchain and advance cash or worldcore?