Here you can find a range of tools to help you with your mushroom forays...
To get started the best thing to know about mushroom picking is that there is no 'golden rule' solution when it comes to identifying unfamiliar mushrooms - edible or otherwise. Do not listen to any 'old wives tales' you may have heard or even read about. Deadly poisonous toadstools can share the same characteristics as many edible ones. This is a mistake you don't want to make. Some people also mention 'taste' as a good pointer, but this is not highly recommended unless you know what species you are dealing with. A nibble on a Death Cap could possibly turn out to be very unpleasant!
Of course, many genera of mushrooms have familiar and reliable traits, but it's always best to know ALL of their specific features. Some species are ridiculously obvious to recognise, like the Giant Puffball, but 'sore thumbs' like these are few and far between. If there was to be a steadfast rule to follow, it would be this: 'If you don't know it's name or have any doubt to it's Identity, then do not eat it'. Simple.
But don't be put off by all this negative scare-mongering, it's there for purely for safety reasons. Enjoying wild mushrooms for food or as a casual interest can be very rewarding. But as a basic rule to oneself, it's smart to employ a sensible attitude when dealing with new discoveries. Play by these rules and you'll be OK. The following may all look very in depth and over the top, but once you're used to the process it can help you overcome basic ID obstacles. It's all part of the fun!