If you want to invite others to your town but have items you worry about, keep them in your travel bag which can be found in your Base Tent/Town Hall.Items in your travel bag cannot be accessed by others and follow you to other islands. Cooking food is as easy as placing it on you...
To play co-op in Dinkum,you need a character that has completed their first day. Essentially, this means you'll need to set up the base tent and work through the tasks that Fletch gives you (set up your tent, make a campfire) before retiring to your sleeping bag. ...