General Rooted, but need help before I flash a new ROM

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http://androidforums.com – I'm a newb so I'm new at this. I rooted my N7 today and installed a (kernel maybe? sorry I don't know what I'm talking about) from poitee using a guide that used Nexus Root Toolkit. Everything went well FWIW but this time I don't have an article to follow so I'm a little lost. I thought what I flashed was what I needed but it isn't, I need to be able to use OTG and charge the N7 at the same time. Here is what I need. I downloaded the CM10 ROM and have it as a zip. I think all I need to do as before is use Nexus Root Toolkit and flash the zip under advanced utilities. On that site there is a (General)