Here are my suggestions:
--Don't get the kit. (but see below) There are things there you don't need. Get a 20 gallon long tank (30"x12"x12"). A 10 gallon is too small. Check out craigslist because you may be able to get one for a lot less than the reptile stores charge. You don't need the light. It's not bad to have, but it's unnecessary as long as there's light in the room.
Check out eBay for heat pads. I use heat cable that can be taped to the bottom of the cage and then removed and taped somewhere else as opposed to the ones with the adhesive that aren't much good once they've been pulled off the surface they were attached to.
Check out craigslist or the pet store for hides and bowls or make your own.
The temperature dial pictured with the kit is useless. You can get a reptile thermometer --digital with a temperature probe-- for about $10 or maybe less.
That said, if all this individual sourcing is overwhelming, go ahead and get a kit, but when you have an adult leopard gecko, it will need a 20 gallon long enclosure.
Don't get the pinky mice. Geckos don't really need them (and what are you going to do if it won't eat the mouse?)
Either one would need a bigger enclosure, at least a 20 for the Leopard and probably bigger for the beardie. If you want to bypass the bugs and special lighting then I'd check out a Crested or Gargoyle Gecko as they have a prepared diet you can purchase and their enclosures would need to be taller instead of long.
The bearded dragon is a really enjoyable pet but it needs a 40 gallon enclosure absolute minimum and the UV light will need to be changed every year or so. Read care sheets on both, as well as for crested geckos and gargoyle geckos and see what looks the most manageable. If you're buying for a 10 year old, try not to get a hatchling but go for a well socialized juvenile.