1: To farm gold for new players I’d say skill the salesperson skill under the exploration skill tree as far as you can. Sell everything you come across and don’t need. To get more out of selling things, have a higher stack amount, since values aren’t rounded. Later on during “midgame” you can craft blueprints and sell those crafted items. Best way to make gold is with planting seeds, but for it to be profitable you need 3 different sets of skills.
2: You can always delete or even change the size of your estate (lot) at any time, if you have the gold for that. Deleting will remove everything (not sure if dynamic items are removed as well, I think they will), changing the size of the estate won’t delete anything.