Pc help needed please

[SeriesLandy]

Hi guys, I'm currently having problems with my sky router (can't connect via LAN) but I also wanted to extend my wired network points in the house so I bought a 24port network switch off eBay.
Should I be able to just plug my devices in and them be given an ip straight away?
When I plug in my laptop I instantly get the link, 100m and fdx lights lit but I can only get limited/ no connectivity in windows. Is there something wrong with the switch or my router?
Thanks in advance.