I'd say you got a great deal. Just get that ri treated and focus on getting their husbandry 100% and get them feeding. Switching from live to f/t can be difficult if they've been on live all their lives but isn't impossible. If I were in your position I'd feed live and make sure they all eat consistently before attempting the switch. That "screaming around for joy while my girlfriend feeds them" comment was pretty funny but the most important thing is to get them all eating. You might have to touch a live rat or two lol wish you the best with them.