Hey there! I was in your situation just a few months ago. I am a representative of a non-profit and am responsible for radio communications. My organization is known as Christmas Tree Lane, and we maintain and decorate trees along a mile stretch of road. We use UHF radio to coordinate our maintenance operations and for staff communications during our annual ceremony. We were going to apply for an itinerant license, however, apparently, we were ineligible. Instead, we had to get a single frequency license. This license issued us one frequency we and only we could use. If you use radios in one location only, this is probably what you'll have to do. Now, to answer your question...
In terms of what forms to fill out, I'm not entirely sure. The FCC does, however, have a forms page here:
https://www.fcc.gov/licensing-databases/forms
Try looking about here, and maybe you will find what you need. Now, here are some alternative options that I HIGHLY recommend.
Alternative option 1: MURS
MURS is a fairly quiet radio band that can be used for voice communications WITHOUT A LICENSE! There are 5 channels you can choose from, or not and simply use all 5. MURS equipment is rare and hard to come across, however, Motorola does make a very good MURS radio called the RMM2050. This radio runs for about 189 dollars a piece and is worth every penny. It is very very VERY durable, as it is the same type of radio you would find being use on other licensed frequencies. I highly recommend going this path.
Alternative option 2: Still get your license... but...
If you are dead set on getting a license, I don't blame you. There are plenty of advantages to this. If you want to get a license, however, I recommend going through a broker rather than filling out the forms yourself. I personally used this method when applying for my organization. Buytwowayradios.com is a great source. They will communicate with you, and help you find the license you need and the frequencies that will be best for you, your area, and your radios. If you don't have radios, you can get them from there too. They will even program your radios for you.
I hope I could help you out. Best of luck. If you have any questions, feel free to respond. I'm happy to help as a 15-year-old who LOVES radios.
Regards,
Joshua