For the newbies, I would say riding around/down the Verderers/Cannop area and then expect them to ride via Parkend,Coleford and finally onto Staunton/Redbrook is to far even on the road/cycle path.
Would suggest the newbies and regular riders have a good full day together at Cannop,it can cater for all and there’s enough to ride XC and DH.
Then the following day you could have a full session at Staunton/Way valley.
It terms of finding the DH stuff,I’m not going to give them away 😉 Just go explore