The 750ti is pretty simple. Just turn off the PC. Open the side.. Remove the back plate from the first slot. Install the video card in there. Reboot the PC. Go in to BIOS select the add-on card (or sometimes the PCIE bus) as your primary video. When windows loads, give it a few minutes and then go to NVidia.com and get the latest drivers.
Transfer the files.
Low tech: get a USB disk
Better: set them up on a local network and share out a folder on the NEW PC and then drop the files you want in this folder.
SImplest way to get your favorites
https://support.microsoft.com/en-us/help/211089/how-to-import-and-export-the-internet-explorer-favorites-folder-to-a-3...