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Yes Do follow forum signatures provide backlinks which are quite useful in terms of SEO.

Well I dont have much Idea about them but I'm hosting my site with justhost and so far so good, never had any serious issues at all.

For cheap and best web hosting services I recommend you to try justhost as they are offering cheap hosting services in less than $4/month.

You need sign up for a hosting server. These days they are many web hosting companies which are providing reliable hosting solutions. Try Google!

I think you should take a look at justhost as they are providing reliable and cheap dedicated server hosting.