Need help with 4-plex goal

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So I live in the Lower southern region of Texas by the border (you've probably seen us on Border Wars).

Anyways...

I'm a newbie with no Investing experience, but highly educated in common sense! I also have a determination to get started in this business.

Lately for some reason the idea of building a 4-plex, holding it, and selling ASAP has been so appealing to me.

Now I have a close friend of mine who is an experienced real estate investor. His business is in the building of Single Family Homes and selling. He claims his "team" can build me a 4-plex for about $80k NOT including the land. My bank will approve me with a $40k personnel loan and a lender will provide me with $80k which I'll need 20% ($20k).

So here are my goals and issues.

Goals:

Build a new 4-plex for about $100k if possible (including land).

Find 4 tenants and rent for $750 - $800

Once the 4 tenants are obtained I would like to place the 4-plex on the market for at least $200k.

Make $100k in profit and re-do but this time with the money I've profited. 

Issues:

Where do I start??!!!!

~any help would be greatly appreciated Thank You~