Need some insight!

So I'm planning on making a few accounts on youtube based off of different niches and then branching out through those accounts to social media platforms such as facebook, twitter and G+. Nothing overly new or groundbreaking with that plan...

The one thing I'm having a hard time deciding though is if I should make blogging type websites associated with each of those accounts or should I save that for later after (hopefully) those accounts start to pick up momentum and a following?

I'm thinking it's an obvious yes that I should do that now, although I'm not very familiar with all the in's and out's that go into making an appealing, user friendly website. That's really my only main concern with making them now as opposed to later. Maybe another thought would be, what if my accounts never pick up traction and fizzle out? Then I just wasted a lot of money on domains and hosting.

On the other hand, what if by some miracle I actually find some success through youtube and social media? Maybe this is a little premature, but I'm thinking about the possibility that someone else sees my accounts and decides to copy their names and make websites based off of them. Is that a legitimate concern or am I just thinking way too hard about it?