Download Infinitecoin Client:
WARNING: Do not download Infinitecoin clients from any web sites other than http://infinitecoin.org or https://bitcointalk.org/index.php?topic=225891.0

Securing your Wallet:
Always Encrypt your wallet with a passphrase. Make sure it is something you will remember!
Encrypting your wallet allows you to set a password for anyone trying to withdraw any funds. This helps protect against thieves, though it cannot protect against keylogging hardware or software.
Never forget your password and Use a strong password!

Decide on what interests you: Mining, Development, Trading or Use of Infinitecoin as a currency.

Upgrading:
If you are running previous version of Infinitecoin-Qt client and would like to upgrade, please follow http://infinitecointalk.org/index.php/topic,72.0.html