hey i wan to build an a remote controlled helicopter as my project?

so wt should i have ie power of the eletric motor,the desgin of circuit board and were do i cn buy tis!!! plz help

The project you are considering is nearly impossible if you try to do it from scratch.
It you buy a kit, you have a chance.
Go read up on the dedicated helicopter forums:
http://www.rcuniverse.com/forum/Helicopter_Beginners_Forum/forumid_165/tt.htm
http://www.rcuniverse.com/forum/Electric_RC_Helis/forumid_167/tt.htm
http://www.rcgroups.com/mini-helis-374/
http://www.rcgroups.com/micro-helis-42/

Good luck!