Acoustic panel for room treatment


Hello,
My audio room size is 15x30x8.
It is in half basement, as seen.
https://www.dropbox.com/s/5v394kjl2b99nx6/IMG_1003.jpg?dl=0

I am thinking of treating the room with some acoustic panels.
Any suggestion? How many? How big? Brands? Where in the wall?
Thanks.
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Reach out to GIK Acoustics for free consultation. 
Oh, man, OP,  you on the edge of a volcano.
Agree this is a huge topic. Would at minimum recc considering treating 1st reflections on side walls (both same side and opposite side speakers)  treating corners with bass traps... treating front wall with 4 inch panels behind your monitors. Absorb or diffuse in your back wall depending on far you sit from it.... huge topic I think GIK free advice would be best. 
I thought it would be pretty simple.
I will talk to GIK.
Thanks.