Client side and Server side SSL profile

Its upto you. The default setting is NONE under server SSL. When you apply a Server SSL profile to VS, the BIG-IP system acts as an SSL client. If you dont intend for the BIG-IP system to present its client certificate on behalf of clients traversing the VS, choose None. If you expect the BIG-IP system to present a client certificate, then choose the appropriate certificate and a key from the list.  (Here certificates and its associated key should be imported on Big-IP system).