Just to add to whatever was said before..
Having a great forum and super advertising is a part of the deal only. You have to find people who is going to be involved into forum discussion. If you advertise your empty forum (it will be empty or almost empty when you start), it's hard to get some starter.
I would find professional who can help you to put some content and quickly respond to forum's users.
Maybe add some kind of blog with your reviews/articles and add "comment on that" to get some good start.
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