Here's a kid-friendly budget template
I started my 6 year old on a budget while we shelter in place. No better time, since we have plenty of it.
I asked him about the things he'd like to do. He began with physical items, then gradually moved towards experiences, which made me very proud.
His budget looks like this:
LONG TERM SAVINGS (5+ YEARS): 3 months of earnings (I chose this one), education, Paris
SHORT TERM SAVINGS (<5 YEARS): giving, gifts, toy/game he has an eye on, Disney World, CN Tower
SPENDING: food, movie theatre, museums, free spending, books, drawing/colouring supplies
His earnings are evenly divided between the 3 groups; he realized very quickly that he didn't have enough to fund every category, so it was a great teaching moment.
FYI he doesn't pay for every category himself! In most cases he contributes; he'll pay part of the checked baggage fee, buy his movie ticket, and get fries at McDonald's. For education, what he saves acts as a round up to what I put aside. The fact that he is an active contributer to his goals and that of the household's is empowering to him.
Good luck if you give it a go!
We're doing a similar thing with our kids (14 and almost 12). My kids get about 1/2 of what nolesrule said, because we give them $1.00 per year of age each month. But in addition to this, I'm giving them the amount of their phone bills (14 year old has a smart phone, so his is a little more, with data plan, 12 year old, just a flip phone with a smaller monthly charge) a little for cosmetics, etc. and then they get to distribute in their budget how they see fit.
They have also set up a wish farm, which for the most part is Lego sets, but some of the more expensive ones, so they're seeing it gradually grow. Plus any birthday/christmas/grandparents being nice money goes towards their choice as well.
My sister actually Included clothing money for her kids. I haven't gotten there yet, but I think it would be a good idea. The more responsibility they have, and life experiences involving money that we can give them, the better off they'll be when they're on their own.