I’ve got a website, Facebook, Instagram and LinkedIn.

in columbus ohio we have to put the value of new builds and the cost of construction if you average enough or look at enough you don't need to talk to anyone. find the city website and do some research first 

Seems like MA has a pretty good website.

Should I have one website advertising both and have business cards list that I offer buy/sell realestate services and PM services.

You can also try building your own website and get very good at seo or ppc in order for the homeowners to reach out to you. 

Costs and Timeline: The process of splitting and developing lots can take time (1.5 years) and may involve significant costs for permits, construction, and other development fees.If you want to learn more about how SB-9 can work for situations like this, check out our website "CityStructure" for more info and helpful resources.

Here's the link to their website: www.stayhikaru.com

We have been around the bigger pockets community for over a decade now and have more 5 star reviews on bigger pockets than any company on this website in any industry (>270  5 Star reviews).

where can we find places-websites to analyze areas that will provide positive cash flow?

If you just find someone random person from those websites, you would be very lucky to find someone that understands REI.If you need a referral, happy to introduce you.