Ravi

Ok you gone a long way! First remove the battery carefully with PLASTIC SPUDGER or else u might short the battery terminals with metal one. Now power on the device without battery for at least 1 min to remove any static. Check for any damage created accidentally when removing the old broken port. You held down the volume and power ( It will boot to recovery mode). As the boot loader is locked by default you are sticked in boot loop. When the above mentioned process is completed. Connect the battery and hold on ONLY power button for 1 minute. It will exit recovery.

Agreeing that you have expertise in hardware swapping and also assuming software expertise, reinstall all the parts and perform the clean install of the MacBook using a USB keyboard and mouse and perform clean OS X install as it might suffered kernel panic or kernel extension problem. Before reinstalling clean the connectors of the trackpad and keyboard in the logic board with ipa. All the best

If you are sure that the screen is a reputed one, remove the screen flex and rearrange and install brackets(assuming if you missed it in case). Lock the flex cable carefully.

Yeah the outer screen will have that circle when the inner screw pierce through the screen from the inside. I agree with ben. Long screw has been used instead of the original screw to hold down the home button.

As the screen is shattered and no longer useful we can use force on three sides, except the side on earpiece. The best part for prying an iPad is having patience. Use the metal spudger for prying.

Below the board. I think it is lower SMD component ( assuming the bents on the wire)

Agree with Chris stables and if volume button is a problem. install Reiboot pro. It is a one switch app to restore to DFU. Don’t use iTunes to restore.

Let the iPad charge with its battery and out of box charger. Wait for 30 minutes. Relax and don’t panic. It will be back to life. Don’t short the SMD’s.

Have you removed the battery before replacing the LCD. If not, remove the battery first and with display connected and press the power to remove any static charge in the components. It could give a chance. Careful while removing.. Don’t use too sharp objects as spudger and double check the battery connector while replacing.

Go to system information and check for WiFi section and you can find your model and replace with it.