There isnt any onboard graphics with AMD FX chips.
Also you will need more RAM (estimate 16GB) for your usage.
Get the FX-8350, its better than the 8150 a roughly the same cost.
Stock cooling is fine unless you are overclocking.
550W is more than enough for the rig, though I would advise a better brand.http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013&Tpk=xfx%20550W