Adding Wireless to existing Network

kevodaly

I need to add a wireless access point to an existing network in a school.
Here's what I'm thinking.

1. Add a wireless router using ethernet to the existing switch - e.g. D-Link DAP-1353/B Wireless N 802.11n Wireless Access Point
( would using 802.11g APs be sufficient at about a third of the cost ? e.g D-Link DWL-G700AP/B 11/54Mbps 802.11g Wireless access point. 10/100Mbps TP LAN port. 64/128-Bit WEP, WPA & WPA2 support)

2. To extend the range, add another access point which would act as a repeater - can this be done wirelessly ? i.e. 2nd access points just connects to the first one ?

3. To extend the range to another building - approx 30 metres apart - can I add an outdoor antenna - e.g. USROBOTICS - PATCH ANTENNA 9 DBI R-SMA ML - to the 2nd access point ?

4. In building 2, using another USROBOTICS - PATCH ANTENNA 9 DBI R-SMA ML, bring the signal inside to another access point which provides the wireless network there there ?

Obviously there's quite a bit of configuration to be done here, but I'm interested to hear if the hardware set up here is possible ?