Advice needed please

Hi all. 

I'm looking for some help please. I currently have Zzoomm fibre and want to change to a netgear nighthawk wiffi 7 router. I also need 2 mesh extenders/boosters. I'm nit sure what would suite. I need better reception around my home. My house is about 175 years old. 

Obviously I don't want to spend a fortune on a system.

If anybody can help or offer some advice on what products might suite I would appreciate the help please. I'm not very clued up on the technical jargon for this kind of stuff.

  Many yha ks in advance.