@ Ronojoy1917
You are combining two items. Chopping is a method to rush production of any item by chopping down forest tiles (after you have researched bronze working). Rushing is attacking an opponent after producing multiple units but it does not necessarily mean that you have to chop forests for the increased production. As PhroX said, you can also use the whip (converting population to production if you are in the civic Slavery which is also available when you have researched bronze working) to produce units faster. Normally, the units that are used in a rush are axemen since they are available after you have researched bronze working and have copper connected, but you can rush with any one of the early units such as warriors or chariots.
A good guide for the early rush was written by Sisuitil and is here:
http://forums.civfanatics.com/showthread.php?t=244075