Guest Wireless Access

I have been tasked with setting up a guest wireless network so that vendors/patients/visitors to our non-profit hospital can access the internet during their visit. I have no budget with which to work and think that we have the existing equipment but not the know how to put it to work. Here is a breakdown of our physical network infrastructure:

4 Cisco AIR-AP1121G-A-K9
5 Cisco WS-C2960G-48TC-L
1 Cisco WS-C3550-48
1 Cisco WS-C2960G-8TC-L
1 Cisco WS-C2960G-24TC-L
1 Cisco WS-C3550-24
1 Cisco ASA 5510

All are using the default VLAN 1, no other VLANs are configured.

We need the guest traffic to separate from our traffic so they don't have access to Patient Information. We would like the traffic to go through our Websense server but it is not necessary. The users would have to be redirected to an Acceptable Use Policy (agree or disagree) before being able to use the internet.

We have the basics when it comes to configuring our switches but our IT team consists of 2 people and we know we can do this just not sure where to start. Any help is greatly appreciated.