Try the iTunes or Windows Media Player visualizers.
no
To start DJing some people find a mentor to help train them in the ways of DJing. You will also need a sound board, mixer, microphones, and speakers.
yes...
No, the Crosley CR248 just to play, not for DJing. Their's a Crosley CR248 model that can transfer your old vinyls and cassettes in to CDs
since 1994-Present
No it is considered a hobby. No it is considered a hobby.
Zayn
Yes way better
Only moderate-end ones offer digital or S/PDIF output. Try getting some DJing 'tables, they should have it.
if you are looking for a free DJ software, you should try "Virtual DJ" software which you can download for free from CNET website. It is compatible to all windowns systems.
Grandmaster Flash is often cited as creating the turntables an intrument
Denon makes a variety of beginner turntables that are great to start DJ'ing with.