Here are some of the trees. You can see the sizes. Quite a variety of conifers and leafy ones.
All of them are "bare-root" so they go in fairly easily - and the ground is soft (mud, actually!) so digging the little hole is OK.
There are some various willow varieties and some twinberry which are just cuttings with no roots yet. We just poke a hole and stick them in quite far. Most will root and leaf quickly.