Can we use Windows 10 Home Edition for business purpose?
You can use either account for whatever purposes you have. What should determine which is whether you need to unravel the few extra features in Pro Account:
Compare Windows 10 Editions – Microsoft.
As to your second question it seems to be best answered here:
[SOLVED] Advancement systems with Windows 10 Home OEM to Pro Level License? – MS Licensing – Spiceworks
Please feel free to ask back any questions and let us know how it goes.