NEWBIE NEEDS HELP!!

hey guys. im building my first rig and i have have fnially received my last couple parts. today im starting to put it together but im already alittle confused. i was getting ready to put my motherboard in place and so i started putting the stand-offs in place on the mobo tray. now i realized that there are alot more holes than screws provided. am i supposed to just support the corners? also, my biggest concern is how to screw the mobo in. i know i must obviously use the holes on the corners, but there are other holes in the mobo that have metal dots surrounding them. what are these holes for? i was originally going to leave them alone but then i started thinking maybe they were used for ground. this is embarassing but i could really use some help. i'm sure ill have more questions once i get this part done so stay tuned :-) thanks for the help

yes that does help because my mobo has 9 holes including those with the metal dots. the only problem now is that most of those holes dont match up with the tray actually none of them do other than the holes on the 4 corners. should i put the standoffs in anyway or could that cause a short if it touches something it shouldnt?

well the mobo is definitely ATX and the case says it supports ATX and micro ATX. unfortunately they didnt send any bumpers with the case. does this mean i have to wait and go buy some bumpers or just install it with the 4 screws? i already installed the memory on a foam cushion that came with the mobo so that it would damage the leads underneath and i can do the same thing with the graphics card.

Match the MB to the I/O shield it came with.

If you attach the front panel connectors from the front of the case to the MB headers before you screw down the MB onto the tray it makes that part of installation much easier.

Put the RAM in too. I remember I had to remount my heatsink because the RAM was a tight fit in underneath it. 5mm clearance

After you have the chip, RAM and heatsink all fitted to the motherboard, install the casefans, then lift the motherboard ensemblage into the case. Screw it in, hook up the case headers, usb, power, reset buttons, LEDs etc, add the cards, VGA and then tidy up the cables. I prefer to wire up the headers before putting the cards in so I can run the cables under the small gaps. Tidy, you know?