Beginner investor - question about taking on HELOC and mortgage for purchase

[Emily Holbrook]

I'm a new-ish investor and am closing on a $90k HELOC within two weeks. I would like to use this money to invest in a rental property (hopefully a small duplex). Seeing as $90k will not likely cover a duplex, I would also need to get a mortgage. Has anyone ever done financing this way? Combining a HELOC and a mortgage? Also, this would create a less-than-ideal CoC ROI situation. My main goal is cash flow. Do I forget about CoC ROI and use another calculation when analyzing properties? Help!

Looking for any advice here. Open to any and all suggestions as I'm still learning.