Cisco AP Aironet 2600 is Cisco enterprise unit. Cisco small business support WAP4410N, WAP121, WAP321, WAP551, and WAP561 AP. However I will answer your questions.
1st personally I like Aironet 2600 and 3500. about guest SSID support do you have layer 2 or layer 3 switch? Get back with me and let me know your router type and switch layer and I will give you advice how to config guest vlan even if AP not support it!
I did search on your device. it is not support vlans. so you can config unit with one single default vlan. all you need to do connect AP to your router/modem ethernet port. try fine AP IP address in router DHCP table. type this IP in your internet browser. AP default user name is cisco password is Cisco. Enable Redio 1st. config SSID, config Encryption and you ready to go. Also here is correct Cisco support forums for you AP
Article ID:5727 Configure the Single Point Setup on the WAP581 Objective
A Wireless Access Point (WAP) connects to a router and serves as a node
to the Wireless Local Area Network (WLAN). Clustering is when multiple
WAPs are joined on the same network. Th...
Article ID:5706 Upgrade the Firmware on the WAP125 Objective New
firmware releases are improvements from previous firmware versions.
Network device performance can be enhanced when an upgrade is made.
Firmware files can be downloaded through: Trivial File...
Article ID:1972 Configure Time Settings on a Wireless Access Point
Objective The system clock provides a network-synchronized time-stamping
service for software events such as message logs. Without synchronized
time, accurate correlation of log files betw...