Visual, emotional, and sounds. I remember one memory at 3.  I remember sitting in my Dad's office at his work and telling someone my address.  For whatever reason I kept saying Kansas City, Missouri instead of the suburb of KC where I lived.  I remember my Dad saying "Nooo, you don't live in Kansas City.  Say it again."  And I remember grinning with embarrassment and trying again but I said it the wrong way again.  Lol.   Crystal Clear memory.
I started kindergarden @ 4 years old.  I remember a lot of it, mostly things I was doing in front of an audience like the talent shoes and the school plays.  I remember writing my name on the first day on the board, and I remember painting as Renoir in the school play.  Not really understanding who that was, I associated the name with rain and I remember painting large drops of blue and green water.  Later that year we had another play and I was assigned as the 'third little pig' in the three little pigs story.  I was pissed.  I wanted to be chicken little (I don't know why lol)  I cried, and I remember my Mom explaining to me that the third little pig was a better part; he outsmarted the wolf and how it was much much better part than chicken little.  That seemed to work, I remember stacking bricks for my house during the play and telling the pig that he couldn't get in, not by the hair of my chinny chin chin. (no wonder I didn't want to be that part.  Not exactly glamorous) 
My oldest memory?  My Dad carrying me upstairs to my room at night. I remember waking up in his arms for a second asking him if it was 30 o'clock.  It's just a second or two and the memory is really fuzzy.  I don't know how old I was but it's not as clear as the one in my Dad's office.  I'm not sure I trust it because the memory is outside of it happening and not from my perspective.  Maybe I was in my mother's arms and my sister was in my Dad's arm and she was the one asking if it was 30 o'clock...but I don't know.