pacific madrone

i'm new to bonsai trees and i just bought a bunch of random seeds to try and grow. i will list them below and hopefully someone will have some advice for how to bonsai them. i'm aware that some or all of these trees may be difficult to bonsai or might not survive at all. i just want to learn...

These are trees I planted from seeds earlier this year and have some extra seedlings to offer: Siberian elm (Ulmus pumila) Pacific madrone (Arbutus menziesii) red alder (Alnus rubra) Japanese alder (Alnus firma) mahagony birch (Betula lenta) shore pine (Pinus contorta) Virginia pine...