What do you mean by "3 returns?" Do you mean you need to file tax returns for three different people? If so you should consider using desktop software instead of online TurboTax.
When you use Online TurboTax, you get one return per fee. Each return needs its own account and user ID. If you use the same account and user ID for a second return, you overwrite the first one and lose it forever.
When you use Desktop TurboTax, which you install from a CD or download to your own hard drive, you can prepare and e-file multiple returns for the cost of the software. You can e-file up to 5 Federal returns—more if you mail the additional ones. If you have multiple returns to prepare for family members, Desktop is more cost effective.
Desktop --unless you specifically buy federal Deluxe only from a retailer-- will include the software for one specific state. You can prepare as many returns for that state as the number of federal returns you prepare. E-filing state returns is an extra fee which can be avoided by printing and mailing the states. Additional--other--state software is an additional fee for the software.
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
https://ttlc.intuit.com/questions/1901306-how-many-times-can-i-e-file-using-the-turbotax-cd-or-downl...
https://ttlc.intuit.com/questions/2942039-what-s-the-difference-between-turbotax-online-and-the-turb...
https://ttlc.intuit.com/questions/2750704-what-are-the-advantages-of-the-turbotax-cd-download-softwa...
Not sure what you mean by "have an agent walk me through.." TurboTax is do-it yourself tax software. No one is going to hold your hand all the way through the program. If you use a paid version you can get customer support and/or help from this user forum.
If you use online TurboTax Live, you can get live help from a CPA and a review of the return before you file it. But be aware it is relatively expensive.
https://ttlc.intuit.com/community/choosing-a-product/help/what-is-turbotax-live/00/27191
If by chance you said "3 returns" because you worked for three different employers and you will have three W-2's---those are not three returns. ALL of your income goes on the same tax return Form 1040, no matter how many W-2's you have.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
