When you file a joint tax return you prepare and file ONE tax return with all of the combined information for both spouses on that one return. You can file a joint return even if one spouse has little or no income. The cost to file a joint return is not more---you are filing ONE return for the fee.
If you have self-employment income you are going to want Live Assisted Premium.
LIVE ASSISTED
https://turbotax.intuit.com/personal-taxes/online/live/how-it-works.htm