questions about virwox and blockchain

i have learned that when you use virwox you can use a bitcoin wallet address to send the bitcoin to bitcoin sites like blockchain.

i do have some questions though:

1. does the other following bitcoin apps/sites coinbase, bitcoin wallet, mycelium, electrum, paxful, airbitz are they like blockchain and allow you to simply change your bitcoin wallet address as many times as you want?

2. seeing how you can change your bitcoin wallet address as many times as you want on blockchain could you theoretically speaking use lets say 6 virwox accounts with 1 blockchain account? or will that get you banned every single time?

3. once you get the bitcoin transferred into a bitcoin wallet to get the funds you just attach a bank account (just like how you would attaching a bank account to a paypal account) to a bitcoin wallet address site such as blockchain and then just withdraw the funds to the bank account that you connected to your blockchain account after you have sold the bitcoins right?

1- You can generate as many new addresses, but you don't change your address the old ones are still linked to your wallet. Just read the wallet website FAQ.
2- What? Ban by who?
3- Yes and no, if you want to exchange BTC to USD/EUR, etc... you'll have to use an exchanger, all online exchangers are also offering you a BTC wallet since you must deposit your BTC in it first.

You should definitely read more about BTC before doing anything else....

3. localbitcoin.com should help