Skill reset from shop is different from class reset. Skills are expertise like wiz skill for example magic missile while class are the wizard, archer etc which have many ranks.
Information about class reset
Information about squire
Yes you can set up shop and go offline or change character.
For class reset, wait the event when we will get big combat update. > skill reset is jsut to reset the skill points of all your trees so you can reput them how you want.
Yeah you can put the Tent, the Table and eat it with another character.
And yeah you can sell when offline, and use it with your other chars. With other chars though you will pay sadly, and lose the 30% fee of money. (Still better than losing the 100% ammount by repairing somewhere else)…