Visa for China - traveling for academic purposes under the Erasmus charter

Dear Sirs
I am traveling as an 'exchange academic' under an Erasmus agreement that my university has with a corresponding Chinese university. I guess I need to obtain an 'F' type. Is this right?

If yes, then can I use a scanned invitation letter from the Chinese University that is inviting me? or do i need the original one to be sent via post?
Further, do I also need to purchase my tickets and hotel accommodation in advance and come with relevant documents to the embassy for an entry permit?

Last, I guess I should go to the embassy for application without the need to book an appointment first? Right? I would also appreciate if you can inform me on how many days does it take for an entry permit to be issued?
Many thanks in advance
Elias