What does it cost to hire a painter ?
-> https://www.forbes.com/home-improvement/painting/cost-to-hire-a-painter
-> https://sucropainting.com/interior-painting-how-much-to-paint-a-house-interior
Here is some good information on primers.
-> https://www.handymansgarage.com/best-paint-primers/
Good web-pages for painting Tip & Tricks.
-> https://www.spectrumpaint.co/10-painting-tips-tricks
-> https://acppaintingllc.com/commercial-painting/professional-painting-tips-tricks-for-commercial-buildings/