Since you're a new rider to dirt bikes, you will drop the bike, probably many, many times.    So, you'll want to protect both the bike and yourself.    For yourself, you'll want a helmet, boots, gloves, knee and shin guards, elbow and shoulder protectors.   For the bike, you'll want a skid plate, radiator guard and bark-busters to protect your levers (and your hands).    Since I live in the US I have no idea what the prices would be in Europe.   

Good luck and have fun.