you'll probably not be able to fly the cp models inside. Once you get really good some people can, but usually not to start with. Overall there are mixed things to say about hobby tron, so I'd stay away from them even though they are right down the street from me.

the venom series are not too popular so it may be harder to find parts for them. You might want to consider buying a heli that your LHS stocks parts for. If you want a non coax heli for indoors, then check out the falcon 40 or the honeybee fp or something like that. Coax for indoors flight is your best bet though, either the cx2 or the lama v3 or v4