How can i Perform a complete factory reboot on a macbook?

I have just brought a new imac and now i want to perform a factory reset on my mac book to clean it all up, but i dont know how can anyone please help me.
thanks in advance.

Welcome to Apple Support Communities.
If there is absolutely nothing on your MacBook you want to save, you can insert the original system CD/DVD disc that came with your computer, use the utilities there to erase the hard drive, reset system passwords, and reinstall OS X and original applications included.
There are various wipe schemes available that erase and over-write the data on the hard drive a number of times, however, these are not 100% guaranteed to absolutely remove all traces of original data.
A determined person or government agency would likely still be able recover some information. If data security is a concern, you might be better purchasing a new hard drive to install and just keeping or destroying the original drive.

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