Acoustic panel for room treatment

My audio room size is 15x30x8.
It is in half basement, as seen.

I am thinking of treating the room with some acoustic panels.
Any suggestion? How many? How big? Brands? Where in the wall?
A386e897 86da 4b28 bd4f 4e3ca8dd24d1Ag insider logo xs@2xihcho
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.