For example last month i was charged $250 to put salt on the steps and sidewalks. 

Find out how they charge you interest, is it on the total loan amount from funding, or do they charge you based on funds you've used (some lenders do not charge you on the whole rehab budget until you use it)?

I recently closed on a duplex in New Jersey and will need to start purchasing materials for the rehab and wanted to see if I could charge those expenses on my business credit card.

I see cash sales frequently for MLS listed properties.

Guilty as charged. 

Meaning write the description, take the photos, figure out how much you plan to charge.

If the house was rented to them with a good lawn, then I would charge them for the grass replacement. 

However, remote investing would not give me all these benefits such as selecting my preferred tenants or going to the court when needed or finding the right contractor that does decent jobs with reasonable charges etc.  

Preferably a MFH with one side has 2, preferably 3/4 beds + 2 full baths with garage (we have an EV that needs to get charged everyday)Or a SFH with 3/4 beds 2 full baths w/ at least 1 car garage.Then we will live in this "livable rental" for couple years, then purchase our "forever home".

As a buyer, most deals presented to me from a wholesaler either have the value of the property over inflated, the costs of the rehab under estimated, or frequently both.