I can only speak for my German education, so of course it may differ to where you are.
> 1. What are the first things you do ? ( learn Ohm's law ? 2+2=4 ? )
Since you're in Lithuania, I took the liberty to pull from the KTU:
https://admissions.ktu.edu/programme/electrical-engineering/#dalykaiSwitching to "Semesters" on the top right shows you what they do and when.
Not really surprising for me is the inclusion of non-related subjects in the first semester - here in Germany, we call that the "studium generale" and it serves the purpose of letting students learn about things unrelated to their main course of study.
> 2. How easy is it at first and how quickly does it get difficult ? ( the learning curve )
Depends on the unversity and the professors. The professors I had that taught the low-semester EE courses were always unhappy with the students and made it very clear that a lot of them do not belong. Quote: "I'd like you to look at the person sitting to your left. Now look at the person sitting to your right. Next semester, they'll both be gone." They wanted to weed out the ones who don't have the passion/determination/skill. If you happen to encounter such a professor then you need to do whatever you can to pass the course. It'll be much easier afterwards and if you do survive, the professor who was arrogant before suddently becomes friendly and helpful.
Of course, there are also the professors who are about to retire, letting virtually anyone pass. It always depends.
> 3. How soon until you start making real projects ? ( idea -> r&d -> end product )
End product? At university? Never
You need to show that you have the right ideas, that you can implement them and that you know what you're doing. The finishing touches (e.g. actually building the thing) are left as an exercise to the reader.
> 4. Are projects assigned for groups or are they individual ? ( Which is more common ? )
For me it was almost always group work, unfortunately. The only times when that was different was when the projects replaced exams.
> 5. How often do you get to make real projects ?
Every day! At home, in your spare time. If you don't do this, you don't have enough passion in my opinion. There are way too many EE/CS engineers who have great degrees but are worthless in the real world. Employers know this, so you'll have a much easier time doing your internship/thesis at a company if you can show them some projects you have done in your spare time. It's a HUGE bonus from my experience - simply because the majority of students don't have anything to show to HR other than a grade sheet.
> 6. What takes up the bulk of your time during studies ? ( regarding lecture content )
Some courses require what is pretty much "homework". That takes quite some time. Other than that, it's helpful to read ahead so you can use the lecture to fill the gaps instead of having the gaps appear after the lecture - but that's not always possible, of course. The rest of the time should be spent socializing (engineering clubs), doing hobbies (electronics, of course) and working out to stay balanced.