Various pre-sales questions

Hello. I recently started a special interest forum on MyBB. It's become a bit more successful than I thought. It's a very nice took but being free, I'm hoping for a platform that's a bit more slick and modern with better support options. To that end I've seen and heard good things about XenForo and have a few questions that didn't come up in general searches.

I will likely remain on the shared hosting service with my current provider until such time as I need greater capacity.

I would...