@Aren Kern It is difficult to assess the expected market rent without knowing the the specific home. 

Some appraisers will not use comps that were cash as it is difficult to find the truth in the deal.

I think having this as a 'personal residence' and the partner not getting anything for an unforeseen period makes this a difficult ask.The 'partner' will also be stuck with having this mortgage show up on his credit report/DTI which will hurt his lending power on future deals.

The only difficult part I see with doing both (as a beginner) is funding, the more you invest in your 401k and Roth IRA, the less you have for those down payments and ways of financing

I started renting a small storage unit where I can keep any extra refrigerator (these had been difficult to find in my local big box stores lately), range and washer and dryer as needed (including if my own washer/dryer suddenly kicks the bucket).

It's a little bit more difficult to find a buyer for that as a wholesaler, because your audience is mostly residential.

It is difficult to reassure someone without a proof of concept.

Calculating an ARV seems to be an easier task, because I can evaluate the sale prices of similar properties in the area, with respect to size, quality and location.However, estimating rehab costs is difficult.

Home prices on NW side have gotten to a point where you can't make a SFH pencil, so unless it's a 2-4 unit, it will be very difficult to hit the numbers on a SFH as a pure investment. 

I'm not saying it can't happen, but finding a high profit flip right now, will most likely be difficult.