Pecon's motherboard that he sent you supports 32gb of memory, it has 4 slots which means it supports a max of 8gb of memory for each slot. If you think you would be the type of person to upgrade your PC to the full 32gb I would say to go for an 8gb stick rather than 4, the only reason to this is that even you will end up having to remove a stick and then buy a 8gb to get it to 32gb. If you think you wil just fill it up to maybe 16gb or something then just keep the 4gb, basically it will save you money down the road.
Also @OP big important thing to remember when building a computer. Make sure to wear shoes and ground yourself. There are two methods that work. You can either go on a machine that is turned on or if its turned off make sure te PSU switch is on and then you can either touch the PSU or the screws connecting to it, that will get rid of any static buildup. Another method that works is before you put anything into your PC, place the PSU in the case, plug into an output and make sure the on switch is on and then touch the PSU or inside of the case, that also works to ground yourself, make sure that when you are done you unplug the cable or turn the switch to off (do both to be sure) otherwise if a component such as the motherboard touches the metal part of the case it sort of "ground" out the motherboard which is why you put standoff screws where the Motheboard goes.
