Am I heading in the right direction?

I'm putting together my first system & I would appreciate it if you could tell me if I'm heading in the right direction! Yesterday I bought (1) Denon AVC-A10SE (maybe different code in the US)THX Surround EX.(2)B&W CDM7SE's as front speakers (Cobra cables)(3) Pioneer Elite DV-05 (Ordered from the US, due to disablement of regional settings & Macro-vision), but now I'm not sure how to proceed. My intention was to get identical rear speakers & the B&W CDMCSE...? My biggest worry is due to the B&W's not being THX Certified, should this in anyway effect my listening enjoyment? I hope these questions aren't too daft!.. I'm new at this! Thanks " An Englishman in Japan"