Step-by-Step Guide to Building a Quality Leads Database for Tech Companies

Hi team! Please give links to videos or guides that describe this way of action (step-by-step for each question below): 1) How to compile a quality database of companies that develop acoustic and vibration measurement instrumentation, number of employees not more than 500, located in US, UK, Germany, Denmark? 2) How to determine that there are no more than 5 developers in the team of such a company? 3) How to find leads from these companies with such positions as Technical Director, CEO, Director of Software Development, Director Process Digitalization, iOT Factory Manager, Innovation Director, etc.? 4) How can a personalized email/message be created for each lead based on relevant content and the company and lead's specialisation? 5) How to transfer these personalised messages to Instantly / and Lemlist for automatic distribution?