Here are the sample of leads  - Top 20 Construction Company in Australia.

I used contactout.com, snovio , salesQL to check the details of each company.

I use some of web research technique I've learned during my lead gen and email marketing training at ProVA

Also Started practicing what I've learned in GohighLevel by making Funnels and Automations.
Basic Funnel Design :

In addition, I also made some Cold Email campaigns in Instantly. 
I build lead list, create an automated script and monitor the campaign's result/KPIs.