To obtain a tourist visa for Dubai, you will need to follow the following steps:

1. Check if you are eligible for a visa: Citizens of certain countries are eligible for a visa on arrival or do not require a visa to enter Dubai. Check the official website of the General Directorate of Residency and Foreigners Affairs (GDRFA) to see if you need a visa and what type of visa you need.

2. Find a sponsor: If you require a visa, you will need to find a sponsor who can apply for the visa on your behalf. This can be a hotel, travel agency, or a relative who is a resident of the UAE.

3. Apply for the visa: Your sponsor can apply for the visa online or through a visa application center. They will need to provide your passport details, visa fee, and other required documents such as a confirmed return ticket, hotel reservation, and a passport-size photograph.

4. Wait for the visa to be processed: The processing time for a tourist visa for Dubai is usually 3 to 5 working days. However, this can vary depending on the type of visa and other factors such as holidays or weekends.

5. Collect your visa: Once your visa is approved, your sponsor will send you a copy of the visa via email or fax. You will need to present this visa copy along with your passport at the Dubai airport upon arrival.

It is important to note that the visa requirements and procedures may change, so it is always a good idea to check the official website of the GDRFA or contact your sponsor for the latest information.