Should we use any amplifier between electrode and IC ADS298 for reception of EEG signals. Also is it necessary for RLD signals ?

I have a recent need for processing EEG signals. I would like to use ADS1298 from TI. 

Q1. Do we need to use any extra amplifier between each EEG channels ?

Q2. Is it necessary for RLD signals in all cases.?

if so which will be the right choice of amplifer.

Please help me.

Regards