vk991 :
You'd be better off with a bit more than that.
The 8320 runs quite warm, especially on the tiny stock cooler. Getting as much fresh air in, and warm air out as possible is always a good idea.
Plus, case fans are like super cheap anyway, so it's really quite an easy upgrade. It may be worth investing in a cheap-but-good aftermarket cooler also, if you can run to it.
should i fit side ways cooler as exhaust or let it blow in (fresh AIr)
All depends on location dude. Generally, I like to recommend positive airflow as opposed to negative. This means in short, more intake fans than exhaust.
People mostly put intake fans on the front of the case, and exhaust at the rear (*giggles*) and top. Heat rises.
Also intakes at the bottom, if your case allows for that.
Of course mounting locations and amount varies from case to case. Some only allow one in the front, some 2. Some larger ones might even allow 3 or more in the top. Just grab some decent enough fans and mount them in the locations you think best, don't forget that intakes will suck in dust as well as air if there isn't a filter there.