Looking to buy first home/ investment. Any tips?

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Hello everyone my girlfriend (soon to be fiancé) and I were looking for an apartment but then we realized that with the prices around our area is best to just buy a house. We are considering buying a two family house that way we can rent the other floor which will pay part of the mortgage. We also plan to move to Florida in the next year or two and we would like this house to be our first investment property. I am just looking for any tips or suggestions such as what expenses I will have and what expenses to consider and also do you think I should get an FHA loan because I know I do need to live in the property for at least a year with that loan. Any advice would be appreciated. Thank you