There are some excellent apps for finding trails in the Surrey Hills. We highly recommend downloading the Trailforks app prior to setting off. This app displays where many of the trails are, their names and a colour rating; green- easy, blue- intermediate and black- difficult. It also shows all the fire roads and main roads that connect the hills.
Surreyhillsmountainbiking.co.uk also offer some great information regarding the area and the trails so we recommend having a browse prior to setting off.