I’m about to close on my first deal and the only way the bank would provide a commitment letter is through a partnership.

Then you act as the bank and owner finance the property to someone else, while collecting a down payment? 

When I spoke with my bank, I told them I was looking at a duplex as rental property and they said 5% was the minimum. 

I will find the property, get a conventional bank loan, find a tenant, do the repairs etc. and manage the property.

I heard on one of the podcasts that there's some sort of line of credit...not sure if this is for all commercial banks, and if so, maybe then it would probably be best for investors to go with the commercial loan? 

Your lender might have their own criteria, but most banks will generally use those guidelines that I've mentioned.

Banks will require you to put it in your name.

I highly recommend  you look into that.Something you might want to look into before you get started1) Soak up as much info as you can so that you know what you're doing.2) Pick a niche and try not to get distracted by various means of investing.3) Build your team before hand - insurance agent, local community banks, lawyer, realtor, property manager and handymen.4) Run numbers on a LOT of properties just to get familiar with the process.5) Research on neighborhoods that work out for you.6) Network.

How do I stay with my anonymous to public, yet not to the bank?

You never get to see the inside of the house or asset securing the debt unless its been abandoned and the bank had to secure it and they took pics.