User Manual Brother MFC-J480DW Wireless Inkjet Color All-in-One Printer

Yes don't worry comes with ink it is recommended to buy
spare cartridges if you print a lot though

Yes, you can print off the glass or from the regular way to
print but you have to plug the printer up or you use the WiFi
if it's compatible. It's not always easy to put other electronic
to it though.

My printer has a black button when i want to print in just
black. it prints in color unless ipress black button.

I used the disk to set up my computer. I don't have a laptop,
so I am not sure.

I installed the latest driver, and the speed increased
threefold!

No, you cannot; once any single cartridge runs out, the
entire printer is paralyzed until you replace it.