Your question isn't clear enough. If you plan to mine CPU based coins, then start to find the coins. If you plan to build GPUs rig, then buy some graphics card. Then what else you need to know?
Say CPU without
Note:
Personally, I do not recommend mining using CPU without GPU. these lists only for knowledge, I doubt if they(coins) making a profit or not.
Coins:
1. Interplanetary BroadCast Coin (IPBC)
2. SumoKoin (SUMO)
3. Intense Coin (ITNS)
4. Graft
5. Bytecoin (BCN)
6. Electroneum (ETN)
7. Monero (XMR)
8. LeviarCoin (XLC)
9. Karbo (KRB)
10. Dinastycoin (DCY)
11. DigitalNote (XDN)
12. Qwertycoin (QWC)
13. Haven Protocol (XHV)
14. Fonero (FNO)
15. Stellite (XTL)
16. Dero
17. Alloy (XAO)
18. PinkStarcoin (PNKS)
19. TurtleCoin (TRTL)
20. Verium
21. Zoin