The Burn trail ends abruptly due to logging.
The first trail to the actual trail system is called IAB (Its A Bitch). IAB does live up to its name as you Bike/Hike 1 mile and gain 500ft, but once at the top there is no more big climbs, the trail are all rolling fun, technical. There are a few great views of the Snoqualmie Valley from up top at Tolt, but most of the trails are classic western Washington lowland forests - ferns, cedar, fir, roots, etc.
Can hold a few big puddles in the wet months, but pretty much rideable year-round.
City of Carnation one mile to the East
After climbing IAB you will come to an area that is called the 5-Way. The 5-Way consists of the IAB, a road ahead, roads left and right and a trail on the right. On group rides this is the area that everyone regroups at.
There is a Logging Road that circles the trail system going by the 5-way. This allows you to exit any of the trails to the road and follow it back to the Five-way.
Two Landmarks to be familiar with are the 5-way and the Yellow Sign. The Yellow Sign is at a four way road intersection, from here you can head East on the road and follow it around to the 5-way. If you come across a Porta Potty then you are heading West and need to turn around and head east.
It is very easy to get lost the first time up to the Tolt. It would be prudent to do a quick ride around the East/North/West/South roads in a loop to get a feel of the area and provide a better reference once you've been riding for a while and come out to a main road (this loop takes 5-10 minutes).
A few of the trails are marked (hanging can lids marked in black sharpie), and using the 5-way and Yellow sign as reference points and the listed map you can figure out what trails you are on or enjoy.