1) yes, you spouse income estimated for current year should also come into the picture if you are filing married filing jointly. You can try out the option of filing Separately as well in the tax caster tool.
2) under the self employed section in Tax caster, enter the net income estimated from business. So expenses are deducted from gross income.
3) yes estimated taxes include, self employment taxes & federal.
4) for state taxes, you would need to visit your state website, if you need to file estimated taxes.
Check the IRS' list of state's department of revenue sites to see your state's requirements. They should also tell you how to make tax payments.
If you don't see your state, reach out to your state's tax franchise board or department of revenue.
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