Do I have to transfer money (Euro) first to make a purchase?
A deposit of EURO to your account at bitcoin.de is not necessary!
When buying cryptocurrencies you will transfer the purchase price directly from your bank account to the seller. If you use a Fidor account, you can also use the accelerated handling of payment by the use of express trading.
Continuative Information:
What benefits does the Fidor bank account have for trading?