Unfortunately yes, -sorry to break it to you, clearomisers do wear out and is usually due to the coil and / or wick.
Dont worry too much though, -you have already made your major purchase already, ---clearomisers can be replaced for a couple of quid.
Thing is with ce4's when they go 'pop' you have to throw the whole unit away and buy another. You can get ce5s (personally I would recommend the iclear16 of these) where you just replace the premade coil part and keep the unit. ( works out a bit cheaper).
However there are other kinds of clearos too such as evods, protanks, aspires, and a multitude of others. I would recommend that you have at least two clearos though when you are starting out, so that if one starts playing up you will always have a back up. Consider getting yourself one of these,- they all have their strengths and weaknesses. Personally I love the aspires, -but most people on here would recommend the evod as the starter kit.
And that's just where your journey begins.... There is a lot more stuff out there where you can get better flavour, vapour, throat hit etc, but pretty much all of us have started out with a ce4 or an evod.
Good luck, let us know how you get on on Tuesday. I'm sure you'll love it