Is starting with a 12-unit building unadvisable?

[Shelby Regner]

I'm still a year or so away from making my first investment and will spend the next several months learning more... but it seems everyone want you to 'cut. your teeth' on a single-family/smaller number of units. Yet, it seems to me, that having more units will decrease your chances of having empty units. So let's say I have some time to read up and save up. Is this a bad idea because of the risk involved? If so, tell me more. If not, what should I read or study that will specifically help with a 12-unit upstairs and restaurant downstairs. ((Also, one of the buildings that's I'm interested in also has cell towers on the roof.))
P.S. Please be nice, I'm a total newb and genuinely want to spend my learning time well. Is my idea naive, too ambitious, or amazing?