I have a question

Quiero decir si tengo que pagar
Yes, you have to pay for the following at the least.
Domain name (anywhere from $9USD upwards depending on domain extension)
Hosting (can be shared, VPS or dedicated server and runs from $10USD a month (decent shared) up to a few hundred USD a month)
Script (if Xenforo then $160 for the first year)

Then if you want a nice style you will usually have to pay for one, or find a free one that you can modify to what you want. Then you have any paid add-ons you may want later.
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