Gian,
Well, if english is your 2nd language, I sure couldn't tell. Man, that's one thing that sucks about being American, I can barely manage my own language, never mind some else's

If you don't apply the elevator, what you (usually) get is a spiraling dive, not a spin. There is a difference, but it's hard to explain. But, once you see it, you'll know it. In a true spin the rate of descent is very slow compared to a vertical dive.

Fly up high, go to idle, and point the nose at the ground. Note how fast the plane is coming down. Now try to do a spin. If the plane is coming down almost as fast, it may not be a true spin.

Another (very violent) way to get in to a spin is to do a snaproll and just hold it, most plane will drop in to a spin from that. Basically, fly level at pretty much any speed or throttle setting. Then, all at the same time, full up elevator, full aileron and rudder in the same direction. You should get a very abrubpt and violent roll, not a big corkscrew. If you do it at high speed and throttle settings, some planes will come apart, but most wont. (If yours does, it's not my fault, ok ). Anyway, just hold those controls and the plane will frequently just fall in to a spin.

Sometimes I like to do a snaproll on a vertical upline, just before I run out of airspeed, then just hold the controls there and let the plane fall back in to a spin the other way. It's very sloppy, but it's fun.