My first Post! Image sources for CPA Marketing?

Hello Everybody ! This is my Virgin post on this forum !
Alright guys so I have been reading in various forum and Now I finally decided to launch my First CPA Campaign !
BUT , I have a question!

I am intending to promote my offer on Social Media text ads, now the question is this.. where do I find my pictures from?
I heard of Free Stock Images but the quality of those photos isn't really good enough?
I understand I can purchase from sites like shuttershock etc. but I dont have that kind of money to sustain myself if I were to really buy them.

Do you guys actually use images from Google image? I am based in Asia by the way.

Thanks for your response in advance guys !

I've used some images from google without problems. Though I try to "make" my own images in photoshop, sometimes I don't have time and/or creativity. Just be sure not to use any brand names or logos! Otherwise will be fine
Good luck man!

I get mines from google I grab a few, put them in one image with the right dimensions for facebook ads.