Need more information. What is your case size and power supply? Since you don't have true links, just list the asus board model number. You may need to flash the bios with an older cpu to get the 8120 to post.
Yes. Be sure to mount the hardrive and optical drive inside the case before you install the motherboard. I also recommend a bare post on wood or cardboard, and let the video card hang over the edge. I use a screwdriver to power up by moving it around the case pin cluster until it fires up. You may also wait to mount the power supply so the cables can reach the board easier. Check the toggle switch on the back of the ps if it doesn't power up. Also double check the power supply leads using newegg's pictures to be sure it has the leads you need for the video card. Good ps also have two 12v leads, one 8 pin and one 4 pin; your board only needs 4 pins, but you can also break off part of the 8 pin instead.