Adding searchable database

Hi

I’m a new user to WordPress – so would very much appreciate detailed/step-by-step instructions.

I’m running a residents association site, and they want to have a searchable list/database of trusted tradespeople.

Is there a plugin that would enable me to do this?

If so, how the hell do I plug it in?

Any downloads of plugins seem to download directly to my pc. I can see a load of files in there…is it just a case of cutting and pasting the PHP file copy…and if so where do I put it?

Sorry for the multitude of questions

Thanks in advance for any help 🙂