Really, you shouldn't help them out much during the game. If you're taking your attention off the rest of the game to coach them, you're not doing your job. If you want to give them pointers, do it between points, not during game play. Let their parents and friends handle that aspect.
Furthermore, if you're wiping off hits on people, keep in mind that the hit you just wiped off may be from another first-timer and it very may well be the first person all day they've shot. Never wipe off a hit in rec-ball. Let the game play itself out. I do agree, it sucks that they got shot out early, but it isn't your job to worry about that. Give them a pointer on why they were shot early and how to avoid it the next point after the current game has ended.
Bottom line, you're on the field as a safety official, not a coach.
CFOA Referee 2012-
PSP Referee 2013-