Hi
I guess the first thing to do is to trawl through websites like
Safety Regulation Group | Safety Regulation ,
European Aviation Safety Agency - easa.europa.eu and also
Aircraft Engineers Bulletin Board - Powered by vBulletin
These would give you an indication as How to go about being an engineer
Licenses are broadly categorised as B1(Airframe and Engines) and B2 (Avionics.... from Aviation Electronics)
1.There are two routes to choose from
a. If you are mechanically inclined then the license to go for is B1
b. If you have an interest in electronics,wires and stuff then B2
I personally think that in due course, you would need to hold both, so its a good thing to have that in mind while you start out.
2. You need to do a few exams (approximately 12....depending on the category chosen)
3.You would then need to prove that you have aviation related practical experience (This could vary from 3-5 years, based on your background)
I hope the above helps
Most importantly along the way you will have to learn to have the right attitude and operate with integrity, dont listen to the all the gloom and gloom, always aim to be good at what you do and pass on your knowledge to others.
It is a great career and lots of pathways to progress
All the best