simple serial number converter

Hi probably i will sound as rl noob but to be hosent with you im 
completely green in vhdl :)
I have question to do and have no idea what to do with it.
Design a system that can be used to convert 8-­‐bit serial no.LSB first 
to an 8-­‐bit serial no. MSB first.Show the timing waveforms for 16 
clock pulses and any control pulses that may be required for the binary 
number 10110100 to be converted to MSB format.

Can anyone help me with this(or tell me how to start)?? i have to use 
xilin plan ahead 14.7

many thanks

mattiq