if the 2 gpus need 6 pin connectors then how does that work with the psu which only comes with 8pin connectors. (this is my first build so i need explanations) and does that also take care of the wireless lan card
They are 6+2 pin connectors which will work on any GPU as either a 6 or an 8 pin PCI-E connector. Your WLan care doesnt look like its going to need any extra power from the PSU. The PCI-E slot on the motherboard can provide up to 75W which is more than enough for it.