Muckrock is a great source to draw upon when creating and submitting your FOIA records request. Muckrock has an extensive collection of records requests that have been submitted by others who use their platform and can be used as a reference to help you create a request of your own. You can see the life of public records requests such as timelines, and the ultimate outcome (voluminous records, denials, no response, etc.) which can provide an indication beforehand of the likelihood of your request being fulfilled.
Muckrock can also help you submit requests and automate follow-up on your behalf. They already have a database of agencies and their public records contact information which will save you time. In cases of delayed responses from agencies, Muckrock will send status requests to the agency as well. The service is reasonably priced charging $20 for four records requests.