Next week our raid times will be going back to 9:30 - 12:30 EST! We also need to get into HEROIC Emerald Nightmare ASAP! That being said, if your item level is below 835 then I am sorry but you will need to sit until you get it up to a more suitable level.
Item level isn't the only ticket into raid either. Your numbers needs to be pretty competitive, there are some people only maxing out at like 60-70k DPS....that's not acceptable these days. I am sorry. So if you are in that range then I would highly suggest studying a better rotation that can be found on sites like Icy-veins... and practice the rotation! Also make sure that you're spending your artifact power correctly!
We need to kick things into Higher Gear! Guilds that we use to help in Warlords of Draenor are now ahead of us!