Mac mini end 2009 Resale : need help to install fresh OS

hi everybody!
sell end 2009 mac mini has been upgraded 2 years ago 8gb ram upgrade , data doubler kit 500gb ssd macsales.com. ssd (with os) replace original hd , original hd replacing superdrive. mac mini running smoothly el capitan (10.11.6).
here data doubler kit : https://eshop.macsales.com/item/owc/ddmm09ssd500/
, ram : https://eshop.macsales.com/item/owc/8566ddr3s8gp/

install fresh os sell mac mini. plugged usb external dvd player mac os x install dvd (10.6.2) had when bought mac mini.
if boot ssd el capitan can't launch mac os x installer (10.6.2)!
tried boot mac os x install dvd (10.6.2) , of course can install software see hd , not ssd. why?
have clean snow leopard install on hd , el capitan datas on ssd.
of course sell computer have clean install on ssd , delete on hd.
there way copy snow leopard install ssd , delete el capitan install? if there no way how can delete personal datas el capitan install?

sorry big story , poor english. hope understand issue!
thanks!

 

i don't know why of things aren't working, feel making harder has trying install old os. i'd do:

1. download elcap installer (or use elcap recovery partition if there).
2. install elcap on ssd, using erase option.
3. boot ssd recovery , wipe hdd.

you have clean install of os x on ssd , files deleted both drives.

 

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