Since he's new to you and sounds like he didn't have a great life before you took him in I'm going to recommend you get a fecal float done just as a matter of course. Also, if you do keep other snakes make sure you are using full quarantine routines for him.
Are you able to supply a length, weight or body dimension for him? Maybe some pictures with something for size reference? It's a bit hard to recommend a feeding program with nothing to go on but his age and gender. Actually are you sure he's a male? It's pretty important to know this as there can be quite the size difference between males and females.
Personally if I had this snake I'd let him settle for a good week or so, then offer him a reasonably sized rat. I like to get to know a snake, it's health status and it's hunting style before I rush into any large meals. I figure better a slower work up to a full feeding routine than triggering a regurge of a huge meal because somethings up that I may have missed.
You mentioned you do have snake experience but just remember that most RTB's have a long, fast and hard strike response. Watch that during feeding time. Most are not picky about what they eat or the feeding method but you'll sort that out once you get to know this particular snake.
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