Alesh Vyhnal:
I am beginer in terms of meditation. Recently I started to meditate this way:
1. Counting breaths one to ten for some time.
2. Next, concentration on the feeling in the nostrils caused by the flow of the breath.
3. Next, concentration on the feeling in the nostrils caused by the flow of the breath and constant asking "who is having this sensation in the nostrils?"
Can I expect some kind of insight or does this lead to jhanic states only?
(Sorry for my imperfect English.)
You can definitely make insight progress doing that kind of meditation.
A variant on this I would do when I wanted to quickly bring tranquility and insight into balance would be to note the vedana (pleasant, unpleasant, or neutral) of my sense of smell about once a second while breathing gently through the nostrils. That's more of a focus on anicca (inconstancy) than what you're doing, which is a focus on anatta (not-self). But typically if you focus on one of the three characteristics, the other two aren't far behind.
Something you may also want to consider working on (in lieu of step #1) is manipulating the breath a little bit so that it's comfortable. Be aware of whether the in-breaths and out-breaths are short, medium, or long. Find out which are the most comfortable for you. And then once you're comfortable, see if you can eliminate the sense of pushing or pulling the breath. This is useful, because it helps the body calm down, which will give rise to a calmer mind, one which is better able to perceive the nature of reality.
Certainly others will chime in with their suggestions, but I think this is a fine way to establish relationship with the breath.