Bakkily on knuckles nuts like a fuckin jock strap.
But there is a set out there that my dad bought when I was like 12ish that came with a board/characters/and a written out DM guide.
Let me look it up for you.
http://www.wizards.com/DnD/Product.a...dacc/217120000
Not sure if this is the same one, but it pretty much gets the point across. And trust me, You will want a map if your kids are only 10 years old. Also, the DM guide is very easy and can help you explain the game better to them. Unless, you want your 10 year olds to have 5 seconds to roll a dice or answer a question before a wall of spikes close in on them...thats up to you!
A good idea to get them started, if they aren't really into it at first that is, is wait until its raining semi-hard and unplug the TV/Computer and tell them there has been a power-outage. The only time I really play is when the power is out and I can't leave the house.