Planting bareroot plants

You could dig a shallow trench in the garden and just "heel" them in - as long as they will be out before the growing season begins. The important thing is to keep them cool, moist (not wet) and frost free, and then plant them asap. Don't store them indoors or in a glasshouse etc - they will start to grow before you're ready for them. If you can't dig a trench then just a big box or even a heavy duty black bag with some soil in it will do - there's no need to pot them individually. Just make sure no roots are exposed and that its damp and cool.
The plants you've listed are generally hardy and will be fine -- how big are things like the birch, crab apple etc? You may need stakes etc when the time comes so make sure you buy what you need.