You have everything you need, except a repeater to use. Click HERE for a list of DMR repeaters in the Central PA area.
Got your ticket? Now it's time to get a DMR ID. It's totally free. You will need to register and obtain your ID HERE.
No repeater in your area? No problem. You can purchase a hotspot to use at home, work or in the car. Click HERE for more information.
Now that you have your paperwork finished, it's time to find a radio. You have several options ranging from high end to low end mobiles and handhelds. Click HERE to look at several options.
To further your skills in amateur radio you may consider joining a local amateur radio club. These folks are a wealth of knowledge and will be able to assist you in just about anything radio RF related.