Install FreeSCAN, and you can download some or all the frequencies from you County and State(which you should tell us about). You may need a USB cable to send the programmed data to the scanner.
You're not alone. There are a lot of folks that buy the DMA radios and don't know where to start.
Don't worry - we've got you covered. We have an article in our wiki with links (anything that's blue) to everything you need - glossary, explanation of trunking, links to software, and most importantly the link to the Easier to Read website. Here's the article link;