So the edge 2 is super fun! Here's some thoughts I've had as a controller without a prostate.
While a prostate orgasm is pretty obviously the hoped for goal, it can take patience and practice to get there. So go into your first few sessions with the edge with the idea of just getting to know the toy.
-Set a time limit with your controller going into the session, I recommend not much more than an hour at a time, especially if you're new to extended anal play. Maybe plan something like 45-60 minutes without touching your cock and have them finish you with another toy, manually or with JOI, once you're at that set time.
-Consider stretching beforehand (seriously, don't look at me like that).

-Lube is your friend with anal play, use a good amount of high quality water based lube (Swiss Navy and Gun Oil have both been recommended to me).

-Setting the edge at a low to moderate steady vibe when inserting can help getting it in.

- Have water and a towel handy.

-Try different positions. The edge likes to come loose so laying in bed might not work for you. Sitting in a firm chair, like a desk or gaming chair has been a very effective way to find the right spot for many people. It allows you to kind of move (rock or grind) into the vibes and makes repositioning the toy easier too. Plus, sitting on it means it's less likely to make a run for it. Some guys I know like to pull their knees up towards their chest (maybe hooking the heels on the seat), this may or may not magnify the vibes.

- You may need to play with the arm of the edge to get it situated in the right spot, this seems to be the most difficult thing for most people.

- After orgasm, have your controller continue controlling the toy, don't just shut it right off.
Most importantly, relax and have fun!
PS: I've been told edge makes a very effective cock toy as well, mileage here may vary. 

PPS: Stretching after a long play session is also highly recommended.