How to turn single family home into a multi-unit property?

[JT Newton]

Hello - I'm new here but excited to join the community! 

I own a home in Seattle extremely close (less than a mile walking) to the Northgate Transit Station and with the new HB1110 "middle housing" bill being adopted I'm interested in tearing down the home and building multiple units on the 4,980 sq ft property. Only problem is I've never taken on an endeavor like this and need guidance on the process, how to navigate the laws, how to determine any investment I'd need etc. 

I'm open to the idea of making a deal with someone more experienced as well provided I get to learn and gain valuable experience in the process. 

Thanks!!

JT