If you do go with wild branches, here's some advice as I just went through the process myself recently.
Get dead, but not rotting, branches as they're best to use. Use a small saw to cut off excessive branches and any pointy parts, strip off any bark, then smooth out the whole thing with sandpaper to remove any roughness and sharp points too small for the saw. Once that's done put the branches in an oven set to 250 degrees Fahrenheit for 2 hours to ensure anything alive in them gets fried (keep an eye to make sure nothing catches aflame, it generally shouldn't at that temperature but better safe than sorry). After they cool wash them thoroughly and they're ready for use.
One other thing is be prepared to shorten a given branch so they fit in the oven. Found that out the hard way.![]()