No one?

Well, there is no way to quote you, in order to answer your multi-part question. So

1Q. is this tree worth collecting? A, No

2Q. when is the best time to collect it? A In your zone Late April-early May

3Q. what kind of tree is it? A Mulberry?

4Q. best collection method? A Dig with hand tools to conserve root mass. Often in collection this means incrimental digging and back filling disturbed soil, so that a secondary root system can develop.

5Q, best soil? A Midwestern loess soil is particularly unsuited to smaller pots. Make a 1/2 bark mulch and 1/2 gran-i-grit fast draining soil. Use the biggest collander or pond basket you can find to air-prune roots.

6A Start to do some of your own due diligence, it will make a happier experience for you. Only touch and science and not protocol will bring you home.

I generally agree with what coppice said. If you feel adventurous, you could use this opportunity for some practice though. Collecting is hard work and failure is likely. Often the roots are not in a tight ball around the base. You could inspect it now and dig a bit close to the base to see if it is worth collecting. If you do dig it next spring treat it like a cutting. That is keep it warm and humid to give it a chance to send out new roots and re-establish itself.