Which private company data sources are good?

Hi everyone, I've been reading for about a week but this is my first post in the community. I've been searching for my first potential deal for around 6 months, primarily looking for service based businesses in the southeast. I've learned that there is a lot I need to learn in order to successfully close. I also learned there is quite a lot of competition in the market right now. I was wondering which data providers folks are using to get an edge and see the market opportunities. Apologies if I'm asking for something people don't typically like to share- but any help would be greatly appreciated. If you don't mind sharing: which data providers do you use and how do you feel about the data?