Halo books help

Hi, I’ve finally got around to reading the Halo books, but I could only find: Ghosts of Onyx, Contact Harvest and Cole Protocol.

From what I understand there’s 3 books before these, would I miss out on much if I read these first?

Thanks.

Look there:

https://forums.halowaypoint.com//yaf_postsm1488298_Read-Halo-novels-in-chronological-order.aspx