Converting home into a duplex?

[Nessa Lyn]

I have a couple strategies that I would love to hear yalls advice and opinions on. I have a single family home that I inherited from my dad and I'm now the successor.

Our house is currently a 2bdrm and on the corner of the block. With two gragaes on each road. Would love to convert into a duplex with separate entrances. Is this pretty difficult to do? We are still paying down the home loan too.

2nd idea would like to add a tiny hone on the property with a separate driveway and use as a str. Would be awesome to even do both ideas. 

Where would you recommend us starting at? How expensive is converting a house to a duplex? 

Thanks!