Easy enough to find, though you can end up going round Yer Tiz twice if you aren't paying attention
No idea what the parking is like, Leigh woods is probably a marginally better place to park than AC, if you can find a space. This is mainly because the road climb in AC is an absolute sod (unless there's parking at the top?).
I've not been to 50 acre woods yet (maybe this weekend), but it looks like it should link in with the other 2 pretty well
1/1.5 times round LW* then 1/1.5 times round AC** & back to the car/ finish off with another loop of LW is nice, depending on how long you want to be out/how far you want to ride
* at the 2nd carpark (stone paving to slow you at the entrance/exit) you can either continue on to the hole in the wall at the start or meet up with the trail at the wooded singletrack section before the skills loop
** if you keep riding past the start of the nova trail it meets up again at the top of the red bit/start of the swoopy section