CallMeNeo

A few years back I bought a refurbished Dell Optiplex 990 with an i5-2500 and I've recently put a 1060 into it along with an SSD. I am looking to transplant this into another case but I'm unsure about how case cooling would work, currently, I've got one exhaust fan, and zero fan headers. Any suggestions as to how I'd go about cooling this not so thermally efficient beast?