There is no standard form for your state, so if you cannot understand the form you are using you will want to ask the clerk if there are instructions or consult a lawyer.

If your wife is your dependent, you can indicate that she's your dependent.

If the form you are using does not indicate whether the income figure requested is gross or net, you would normally indicate gross, but again you would want to check to see if the form comes with instructions. You can always incidate "$XXX (gross), $YYY (net)". You indicate how much you are paid, not how much you would be paid if you worked fewer hours.

If the space for property exemptions is designated as the place to list property you believe is exempt, that's what you would do. If it's for something else, you would do that something else. We have no access to the form.