As a 3rd year med student, I think the above post regarding doing well on Step 1 is quite important. I'll tell you why...
During your clinical years you will really find out what you want to do, and it is very possible that you will change your mind about what specialty you may want to go into. You may not believe this, but it's true, I never even considered doing Anesthesia until 3rd year. BUT, what I knew before starting 3rd year is that I had to do well on Step 1, simply because you cannot predict the future and you want to have the strong scores so that all your doors are open when you finally do make that decision.
Point being, Anesthesia is great, but as a 1st year med student, you may change your mind in 2 years, so keep your doors open by doing well in classes and step 1.
So, some basic things to consider
(1) Do well in your courses
(2) Do well on Step 1
(3) Get involved in clubs, ex, anesthesia club, if there isn't one at your school, start one
(4) Get involved with ASA at a national level. I forget right now what the student committee is called, but they have one
(5) Do research b/w 1st and 2nd year, in anesthesia or something else. Look at FAER. (Considering perhaps doing something international)
Anyway, my 2 cents...
Good luck...