From Taunton station you’ll have about a 10 mile road ride up into the hills, some of that is one long but steady climb, but nothing to bad, just save yourself for the real hills.
It’s likely you’ll join the off road bits at Lydeard Hill car park and then follow the ridge to crowcombe, enjoying the views east and west, there are forest trails east of triscombe around cockercombe, though these are mostly DH runs or forest tracks, great wood has the classic Chimney and a couple other non forest track trails.
North of the crowcombe to over stowey road, is where most of the riding is, holford combe, hodders, somerton, weacombe, smiths etc…
You maybe able to cadge a lift from locals if you plan a head and if the above STW ride gets going, there will be a lift sorted for you to save you legs.
Knottie, set a date, i may just make a return visit just for that.