Gathering names and contacts for a list of 29 companies

I have a spreadsheet with around 30 companies listed with their web addresses along with the following empty columns –
Number of employees
Web address for company (completed)
Linkedin URL for company
Contact – I need the name of the senior sales leader eg. sales director / commercial director / responsible for the UK and Ireland I also need the CEO / MD contact details
Position – person’s job title
Linkedin profile address for the person
Work Email address for the contact
Work direct contact number
Mobile contact number
Source of data
I need each of these columns to be populated with the correct data