What do i have to do to get a proposition on a ballot in illinois?

what do i have to do to get a proposition on a ballot in illinois? do i have to write someone? if so, who? do i need to get signatures? if so, how many? where do i find out this information? do i need certain forms? if so, where do i get these? if i need signatures, can i get them online? any information would be greatly appreciated. remember, this is in illinois.