Dave,
Joe has some very good points, especially about partnerships and why we would do a partnership. I subscribe to his philosophy and just don't do partnership, however, I do a LOT of joint ventures, and would suggest that for you. Bring to the table what YOU do best (and can do) and likewise with your partner. And split things according to that, it may not be a 50/50 and that's probably best.
I could also argue for you to have your properties and you buddy to have his. And you really don't need an LLC (yet). Hold the properties in trust.
So, what can you provide and what can your friend provide.
Quite comment, a joint venture might look like this:
You find the property, negotiate the purchase, and manage it.
He provides the down payment.
Who ever has the biggest income tax problem owns it.
The rent is split on whatever numbers you decide on, and you need to decide who pays when there's negative cash flows (big maintenace or vacancy).
The non owner gets an option to buy part of the upside when sold. (whatever percentage you decide on).
I've done both side of the above. The big requirement is that the negotiator/manager have some experience. Sounds like you've read up on things, so time to apply them. You might want a good experienced investor to coach you thru the first deal. Your real estate buddy could be that guy. Now, he's an apartment guy, I'd strongly suggest single family homes for you.... there's tons of advantages.
Another point....as Joe said, don't make a calendar commitment date, make a financial commitment goal.
Don't know your market in Cape Girardeau, but I could argue just to stay there. Most likely you can make all the money you want right there. Big enough. However, you do want a nice home that attracts a great tenant and you want a motivated seller to get a reasonably good deal.
BTW, love your town, been there many times!