Hi from Mississippi

Hi all,
I am new here and have recently decided to move forward in my business and do commercial work as well. I purchased 2 Melco EMC6/4-T machines and I literally dont have the first clue as to what they are about. I really need help. I need brands of durable needles, stabilizer, thread. Also as far as logo digitizing, what file format would I need the logo to come back in to work on the machine? I literally know NOTHING so any insight would be greatly appreciated.

Thanks
Kayla