The way credit cards work is like a loan, you pay it off later, you'll need a company to set this up to be able to loan bitcoins to their clients
For what is necessary read the above my post. As for the other things written in your post read below.
What are you talking about? What have to do the loan with the credit card. If i have revenue in bitcoin I can deposit or send the amount of (the needed) bitcoin to the provider of the card the day in which i must pay all the expenses made with my bitcoin credit card. That's all. Everything finish here. I pay my debt to the provider of the bitcoin credit card and the next month begin the same story from the beginning. I can use it again for everything I do or need. It is so simple like one and one make two.