I've been building a couple of them and have a couple of spots planned. I am waiting on a delivery of some materials, but soon! I have a few people who want to help, and more expressing interest all the time, plus I may have wwoofers. Is a weekday or a weekend better for you? We have at least two projects planned for the near future but I haven't nailed anything down yet.
Tools: A wheelbarrow is a big help, we have only one good one. A manure fork is helpful, one of ours has a broken handle. We have a bunch of shovels. A scoop of soil from the woods...
Cardboard without the shiny stuff on it is always welcome. The most valuable resource that we have is our own human ideas and enthusiasm.