In episode one Skobie talks about Sound Packs.  

Sound packs are the best way for you to build your personal library of samples.  

Skobies top 3 favorite sites to get sound packs from are.   

https://primeloops.com

 https://www.thelooploft.com/

 https://www.modernproducers.com/

These websites provide royaltie free sounds and samples, that you can use in your music.