Can someone help me out. Have account with IB and want to link it to NinjaTrader (TWS of IB) which would be best to trade futures within NT. And what Data would I need to trade these six instruments.
GC
YM
RTY
ES
CL
6E
Could I get all these with 1 subscription?. Or would I need more than one data provider?.

It should work. However, you better ask IB on all those issues.

GC is COMEX
YM is CBOT
RTY, ES & 6E are all CME
CL is NYMEX

So even though they are all 'CME' exchanges they are actually 4 different exchanges. As a professional I would have to pay $130 odd for each exchange but as a retail investor you can probably get them for $1 each.