A question of strategy in 4 rental units

[David Lee Maldoon]

So I have always dreamed of owning property all over the place and renting it out with the knowlege that i will never sell it and always keep it rent it and update it continuously how much would i need to buy 4 rental units ( 2 duplexes) and fix them up from peoples experiences? what strategies and things should i lool for to determine all this? This will be my first purchase of real estate i will be buying. Also I am looking for anywhere in the state of California because i have alot of connections in various industries that have tought them. How to build the latest madated codes. Who have offered to do the work themselves if they can be the first renters.