Does this come with a full size port for memory cards?

This comes with a Micro SD card reader.

will chromebook support my existing wireless mouse and non-wireless HP printer D1660?

Depends on the type of wireless mouse. It has built-in Bluetooth, so any BT mouse should work. Not BT wireless mice will *probably* work as well, but with the very limited number of USB ports, I wouldn't recommend it. As for your printer, I honestly don't know.