We're looking at getting a real tree this year for the first time ever. As we've never had one before we've got no Christmas tree lights, so I'm wondering if you could please help me out. For an approx 6-7ft real tree, how many lights am I likely to want, and what length of light string? I'd say if 0=very sparse lights and 10=so many lights you can barely see the tree, I'm probably a 6.5-7 if that helps. Thanks in advance 