To find the address of a file entry point in Immunity Debugger.
note: images to follow :)

1. Start the program
2. Attach the program to Immunity Debugger
3. Click on the letter e to open up the Executable modules window
4. Locate the file you are running
5. Under the entry tab will be the address
6. Copy the address, right click and copy to clipboard then select entry
7. Click on the letter c to take you back to the CPU window
8. Click on the forward arrow with the four dots this will open up the Enter expression to follow window
9. Paste in the address, and click OK