Different countries have different visa requirements so if you are a national of Dominican Republic or even just a resident of this country trying to visit the USA as a tourist then you will want to find out whether you require a visa. Different visa categories have different requirements and information is available from any US Consular office in your city.
While it may seem to be easy and straightforward to just fill in the application form and submit the required documents and file your visa application, it may not necessarily be the best way for you to proceed. This is particularly true if you are applying for the first time as you need to be doing everything correctly lest certain avoidable errors lead to your visa rejection.
This is why you will find many visa applicants from Dominican Republic proceeding with their US visa applications through third party agencies who specialise in guiding applicants accordingly. You can find several how to apply for USA Tourist Visa Dominican republic websites that you could visit for assistance.
Choose your visa centre carefully so that you only work with those who have a great deal of experience helping Dominican Republicans file their US visa applications and get approvals most of the time. USA visas for tourism may seem to be the easiest to apply but these are often the most difficult ones to get approvals for.