E36 M3 Evo convertable help

[matt1275]

I have just bought the cheapest m3 evo convertable ever i think on a whim and for this i have several jobs to do, car is a 96 has covered 60k with history but two things i need to know

I have read many questions on here about the vanos being dodgy. What is vanos and how will i know if mines knackered

second the roof does not come down it does absolutely nothing no noises clickings or anything else,does anyone know of any areas to try first ie dodgy areas or componets