How much do you already know about music? Do you know why there are black keys and white keys on a piano? Do you know what a major scale is?
A violin might be tough for a newbie because there aren't any frets, that is, you have to know the tone of the notes in order to play correctly. You don't have frets to control the tone. Your tone is controlled by the placement of your fingertip. You can be in tune with yourself, but when with other musicians you'll all have to be in tune.
Looking at a piano, the white keys going from C to C, is the C major scale. The black keys between are the flat/sharps. The four notes without black keys between them are E,F and B,C . When you start learning music, you'll learn that the major scale intervals are whole, whole, half, whole, whole, whole, half. When placing your fingers on the fretboard, your interval between E & F, and B & C, will be less when in the key of C. That's my theory lesson for you.
I play guitar. The internet has a lot of free stuff for guitarists. I bet there are lot of the same for violinists.
Tuning is simpler nowadays, because there are clip-on tuners. New learners may break a few strings. Check here: Ebay