What kind of targets are you looking for? What kind of places do you hunt?
I'm no expert, but I have a suggestion which may be helpful.
If you're mostly looking for coins, try the attached pattern. Its called the Trashy Park program and was created by a forum member, Bill_S (DirtFishing on YouTube). It was originally designed for the Minelab Etrac, but it works just as well for the CTX.
The settings are 50 tones conductive, high trash separation, deep "on" & fast "off".
The idea behind the program is to make it easy to cherry pick targets in the coin range when hunting places with modern trash. Since it uses a lot of discrimination, its a great program for new users to get their feet wet. It'll let you get used to what some good signals sound like without digging a ton of trash. As you get more comfortable with the machine, you can open up the pattern to accept more target ranges, basically creating your own custom program based off of this one.
You can either create the pattern on the detector itself, or use the Xchange 2 software which is a little quicker.
Aside from that, the suggestions already mentioned are good ones. Pick up a copy of Andy's book and in your spare time, check out some YouTube videos on the CTX. When I first got mine, I learned a lot just from watching others use it.
The CTX is a great machine. Good luck with yours!
{Edit} I just noticed you're from Ireland. I have no idea where Irish coins read, so the Trashy Park program might not work for you. In that case, Andy's book is a great place to start. You can create your own pattern by testing a lot of coins or other targets that you wish to find and making notes of where they read. Set up your pattern to accept those ranges.