I would advise you to read some books so as to be familiar with strategiesHere are a fewSee if you can get a copy of The Millionnaire Real Estate Investor by Keller.The Slight Edge and Atomic Habits too.https://www.amazon.com/Building-Wealth-One-House-Time/dp/007...

But I don’t know what value they will add and how to find a good one.

From my experience, one of the first things I did was choose a specific market to focus on.

Or should I just have one website that caters towards buyers and sellers? 

Then I would get a bridge loan (assuming each is above $100k purchase) and put $25k down on each one, get the lender to finance the loan for 12 months and give you 80-90% consruction costs then when complete refinance to a DSCR.

I know there is one in PK but looking to do a northern Ulster one either in Kingston or Saugerties.

The most successful Real Estate people I've known in the past 40+ years were not the Smartest, not ones with the most money, not the ones with the most connections,BUTThey were the MOST Persistent!

My ultimate goal is to build cashflow and give back to my community one way or another. 

I know that if you get a use and occupancy certifcate, the vacant building notice is automatically removed, but I don't know if there is a way to remove one without it.

Don’t be one of them.There were different ways that potential buyers wasted my time.