Software developer - "What things do you look for in a CRM?"

Spend at least 2 hours per day researching online about your desired investment strategies.

Then just handle it yourself with some basic software(Stessa, e.g).

I recommend having a pricing software (pricelabs perhaps). 

Documenting your journey online or engaging on LinkedIn can also help expand your network.

My recommendation would be to get approved as a Landlord, contact the director's office and request that an inspection be completed before a tenant is selected (sometimes they will do this as long as you select a tenant within 14 days - which you want anyways), and have an online application and screening resource in place.  

Online metrics can be good, but they wont paint the whole picture. 

Quote from @Zach Howard: Quote from @Jonathan Greene: If you are looking at properties in the US only on Zillow, and not seeing them in person (I know you are in Hong Kong), this is just an effort in futility because you can't underwrite single-family or small multifamily deals only online.

You can always use a software like Turbo-Tax and follow the prompts.

Then you'll need to find land, acquire it, find a spec home buyer and set up meetings to design plans or buy a set online with mods.