Please let me know if a startup company, started a month back can file
for green card under PERM for its employees?or Is there any wait period,
for the company, say a year or few years before they can start the
labor process?

If startup company for file for green card, please provide the web
link for rule or immigration site that addresses this.

Thanks a lot!

Check out these sites:
http://66.102.9.104/search?q=cache:ogRtTiwpjxQJ:workforcesecurity.doleta.gov/foreign/perm.asp+uscis+perm&hl=en&ct=clnk&cd=1
(Only the cached file would open.  
The original:  workforcesecurity.doleta.gov/foreign/perm.asp

http://www.immigration.com/dollinks/permindex.html
http://www.usavisanow.com/lcgreencardkit-dl.html