Help Schema Sharing Internet

[tenkuken]

I'm newbie here.
But i need to build this infrastructur. All i have is :
1. WL500gP
2. ISP with wireless connecction :
SSID : HotSpot
DHCP Enabled
HTML authtentication.
Known : IP and MAC Address.

All i need is share those "Internet connection from my ISP", so my LAN can be
access internet.
Please take alook the scheme on the "RED BOX".
1. Can you recomended what Access point to buy ? (Linksys, asus, dlink, jaht)
2. Should i choose Access point with "Router / Bridge / NAT / etc ?"
3. Can u tell me how to set up WL500gP in this case ?

Thanks alot..