It's awesome that you're looking to get started with house hacking a duplex. I did the same thing last summer in southeastern Columbus and it's been working out great.
There's a lot of good advice posted already. I would add that the most important thing to get started with your first deal is to not overthink it and to go do it. Trying to get the math exactly right probably isn't going to happen on this first deal, largely because you learn a lot by actually going through the process. Talking to an experienced real estate agent, lender, and insurance agent who can give ballpark numbers of what to expect is really helpful. Aside from that find general conservative numbers you can use to calculate the other expenses and start making offers.
The big advantage of house hacking is that you have a lot more flexibility in case something does go wrong and even a bad deal will likely save you a lot more money per month than renting somewhere else.
Good luck!