oll pll

Which to learn first after 4LLL? OLL or PLL.

Hey all!!! I've been speedcubing on the 2x2 for about a month, and yesterday I got 8.55 seconds, using the layer by layer method, with OLL and PLL. I was just wondering if anybody has any tips for me to get a little bit quicker. Thanks!!! Find my 8.55 PB video here...

At the point i am at now i guess it be about time to learn OLL, however theres 57 of them, i already know about 18 from PLLs and some memorization here and there. Now i want to learn the rest of them, right now i have notecards layed out with the pattern on one side and the alg on the back...