Reassemble the LCD display as explained on iFixit.

No other work needs to be done. As you removed the power cable the SMC should reset, which is the chip configuring your hardware.

If all goes well, you should be greeted with a welcome screen and "About This Mac" should show the image to the left.

Note: I also replaced the optical drive with a 256GB SSD, which can be done easily during the installation process.

Last tip: If you remove the optical drive for an SSD, make a minimal bootcamp partition and install Windows on it. It will save you a lot of trouble if you ever need one. Believe me, simply do it. Installing bootcamp with no optical drive is a pain.