Download the configuration file for your OS.
If you are running a UNIX-like operating system: Client port
If you are running Microsoft Windows: Client port
For all systems: In addition to the configuration file, you must
download a set of key files that help secure, encrypt and verify your
connection to the anoNet entry point. Download them as a ZIP file here. These are temporary keys just to get you on the network.
You can come straight to #anonet on the IRC server at 1.1.1.1, dead:beef::1 (if your IPv6 is working) or 1.0.9.1 port 6667 or port 6697 (for SSL connections) and say hello. Use a nickname that you don't use elsewhere. From there you can get help with the rest of the network.
If you are not the social type, you can head straight to the Wiki at http://www.wiki.ano or http://1.0.9.3/ if you don't get a DNS server pushed to you.