This is my first post here, and whilst I've done a bit of searching around the site, if I've missed something that answers some of the below please point me in the right direction.
I used to do a bit of camping when I was a kid, but that was a long time ago. More recently I've done a few day walks with the kids, generally in the 2-3 hour range. The kids (6 and

From a gear perspective:
Back packs => Want the kids to carry something, but am realistic so planning on giving them a day pack each with their sleeping mat and bag, then day food and water. Any suggestions on how much they can carry? Our first walk will probably be ~7km/day.
tend, sleeping bags, mats => tick
pans/billy/stove/etc etc => my mate has put his hand up to take care of this, so I'm leaving the kitchening to him.
walking boots => for kids, is it ok to scotchguard an old pair of sneakers? I struggle with the concept of buying hiking boots that will be worn once or twice before they grow out of them.
comfy shoes (eg, sneakers) => do I need to take a 2nd pair? I assume I should in case the first pair get soaked?
gaiters (mud/bushes/snakes) => would the bunnings style lawnmowing gaiters do? or do I get proper gaiters?
cutlery and crockery => assume I can just get something from disposals store, any pros and cons of metal vs plastic I should consider (other than weight)
waterproofs => I have full waterproofs for myself, but only tops for the kids. If the weather or forecast is bad we simply won't go, so I'm assuming this will be ok. Likewise if we get stuck and end up on a short walk instead and pitch tents somewhere earlier, well so be it. However - let me ask the question -> am I being overly tight? Should I just ante up for some waterproof pants for the kids?
In terms of clothing, the kids have thermals, puffer jackets (kathmandu 550), and then normal kid stuff. From what I've read I'll be finding a weekend's supply of non-cotton clothing (may require a few more purchases) but I'm assuming that apart from making sure we have ample supply of warm clothes there isn't much to worry about here.
Is there anything else I should think of in terms of doing some gentle walking with the kids? They're both pretty stoic, but haven't done anything like this before (haven't even been car camping). Any general suggestions?
Cheers,
Dim