Hello and congratulations on your wedding!
Except with limited exceptions, married couples need to file a joint return (MFJ) to qualify for the premium tax credit and other savings on marketplace insurance. See the link below for more information. You are correct that filing your taxes together is combining your income together on the same return. The good thing is that in most cases, you will have a lower tax bill than if you filed separately.
With TurboTax you will enter the information for each spouse separately, starting with the personal information. Early in the process TurboTax will allow you to confirm your filing status as MFJ, which should give you the best tax outcome.
As you enter other income information, TurboTax may ask you to whom a document belongs "Is this W-2 for Jamie or Robin?". When it comes to your self-employment activities, you will similarly enter your information separately, keeping the income and expenses separated. You'll both have a separate Schedule C if your spouse is a contractor. TurboTax will handle combining your income and making sure you get all the deductions for which you qualify.
Additional information about the Premium Tax Credit:
https://www.irs.gov/affordable-care-act/individuals-and-families/questions-and-answers-on-the-premiu...
An tax article for newlyweds:
https://turbotax.intuit.com/tax-tips/marriage/getting-married/L0DvEUlEC
Thanks for reaching out,
jscottjr_CPA
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