Zwitterionic/un-ionized/acidic structures of valine & phenylalanine

Write out the un-ionized structure of valine & phnylalanine.  Do either have enantiomers?

Write the zwitterion structures of both.

Show what happens if it becomes more acidic.

Write structure for phe-val (ionized or unionized).  Is it the same as val-phe? Why?

Would the dipeptide be neutral, acidic, or basic? Why?

**I'm so confused on this concept.  He had to cancel class this week and didn't lecture on any of this so I'm trying to figure it out on my own.  Any light you can shed would be very appreciated!!!