There two options

1. On arrival visa which you will get on airport dubai.
One Visa = 185 Dirham

2. Pre-arrange visa; One Visa start from 300QAR

Bring your passport and Go to any airlines as per your budget (I suggest not to travel agent but direct airlines counter)

ask them your entitlement, u can get point 1 or 2.

If you're OK, booking the ticket.