First, from very recent experience... if there are many trees or water hazards, please don't send them out with just one disc. It can go astray, and there's nothing, NOTHING that sucks more than walking off the course 8 holes into it because you have no disc.
So, get AT LEAST two discs for the player.
Which discs? Personally, I'd go with two mild midrange discs. Shark, Gateway Element, beat-in Roc or buzzz, even a stingray, or some such.
If the person is at all athletic, maybe, like Noill Golf said, have a fairway driver on hand. Leopard's good. FD or TL would be the best, IMO. But some mellow fairway driver.
I found that the deep rim on putters made me way more likely to shank when I started than the relatively thinner rims on mids.
The weights on the discs, if you have any control... if it's a kid, go as low as possible. A smallish female, maybe try for the 150 class. Normal male or not small female, try to keep it in the 160s.
Whatever you do. WHATEVER you do, get screamingly brightly colored discs for them. Hunting discs is no fun, doubly so on your first round, when you may not be paying super close attention to where your shot went, or you get a blind roll-away.