Welcome aboard. I don't use a CTX3030, but just starting out with a new detector there are a couple of things that are basic.
First off, read the manual for at least having a idea of what the various functions do.
Secondly, lay various denominations of coins out and scan over each for getting an idea of what each read and sound like.
Third, until you get familiar with the 3030, just hunt in the pre-set modes. (I'm assuming it has pre-sets).
Learn it and from what I know of the 3030, it is great coin hunting unit. Good luck and I'm sure others will chime in, HH jim tn