if i lock my stolen macbook pro can i still locate it through icloud id & find my mac option?

Lock it and if your computer meets all the requirements for Find My you might be able to find it.

Apple - Find My iPhone, iPad and Mac - http://www.apple.com/icloud/find-my-iphone.html and: iCloud: Find My iPhone overview - http://support.apple.com/kb/PH2696

The following conditions ALL have to be met:

1) You have the "Find My" activated BEFORE you lose the device.

2) The device is turned on and for cellular connection has a SIM card installed.

3) The device is able to connect to a registered wifi connection. (iPad, iPhone, iPod Touch) or data network (iPhone, iPad with cellular).

4) The device was not restored by a finder of the device (if it was really stolen then the thief has probably restored it unless you are running iOS7+ and activation lock is active).

Yes.

iCloud: Locate your device - https://support.apple.com/kb/PH2698- "If Find My iPhone can’t locate the device, the last known location is displayed for up to 24 hours. "

iCloud: Lock and track your device using Lost Mode - http://support.apple.com/kb/PH2700 - also how to unlock