Hunt Group Assistance

Can someone provide me with easy to follow instructions on setting up a hunt group.  Currently when my main line is answered if another call comes in at the same time that call goes to the busy auto-attendent & I don't want that.  I want to set it up so that if two calls come in more or less at the same time that the in-coming call goes to the next avialable line ( I have 4 specific people that I would like to be able to answer calls)  Unfortunatly when I went through my call flow appointment I thought I explained this correctly, but I find that the way I previously handled this situation in my old environment & how Comcast handles it didn't translate well at all.