I'm looking to purchase a duplex or triplex in the next 6 months and rent out half or all units, to pay my mortgage and have a healthy cashflow coming in.

One option but I have no personal knowledge of it is lending sites like Prosper.com Where people post requests and investors offer part or all of the money needed and the site coordinates it.

I don't care if one of you gets it all or all of you share it.

If time is on your side consider looking for a 2-4 unit that you can still be comfortable in but also in an area that will cash flow well enough to cover most or all of the mortgage.

But maybe structure it so that some or all of the rent and option fee are credited to purchase if exercised. 

It's usually pretty standard to find tenants paying gas/electric... but if there aren't 4 separate furnaces and/or separate meters you may end up paying some or all of the gas.

I have been working as a commercial property manager specializing in low, mid and high rise office buildings as well as single tenant and multi tenant industrial buildings/parks.NNN leasing (or NN or N) involves the tenant paying for costs such as insurance, taxes or all of the maintenance (including property management fees).

My advice in the case you are using a method other than cash on hand to get cash for some or all of your down payment is this.Figure out what your monthly expenses are for the property.  

Is there currently an owner-occupied unit, or all they all rented? 

If there are any flip/remodel folks that want to help educate me, I can provide some or all of the funding in a joint venture.