Line the inside bottom of your main garden box with weed blocking fabric, stapling it to the inside edges:
Place each raised bed frame into place and let your kids inspect the arrangement:
Check for level, you don't want all your precious rain water running right off next spring before it can reach the roots of your plants. You can use little "shims" from the home improvement store to level up the corners of your individual raised beds.
This part is fun for the kiddos - fill the walkways between the raised beds with pea gravel. This is easily found at your local home improvement store. I used about 6 bags. The kids love using rakes and trowels and hands to smooth it all into place.
This pea gravel gives you a well draining walkway that discourages weeds AND it's so pretty!
Now, fill your interior boxes with soil and you're good to go!
For good measure: I mixed in one bag of manure compost to the soil in each raised bed.
Pretty as a picture.
If a fence is necessary in your location, I can show you how we build ours next week. Now, get to work! You're in the home stretch!