Wow. . . everyone is telling you to jump right in on the Mentalism band wagon when you've yet to learn the fundamentals of magic. . . While it can be done let me point out that Mentalism relies more on showmanship skills than traditional magic, the psychology of presenting it is completely different than magic and too, there are many aspect to this art form that are rarely mentioned in books, or that are known of by those that approach Mentalism as they would Magic.
BEFORE you jump into Mentalism (and I do understand that you just want to do some fun bits here and there) I would advise that you pick-up by Bill Tarr books on slight-of-hand entitled "Now You See It; Now You Don't". This will give you a foundation skill set via which you can easily develop your own series of random "improvisational" routines using what's on hand. I will likewise suggest you get a copy of "Magic & Showmanship" so that you have a more rounded understanding as to what it is we do and how it's done.
You will find a series of great videos via Stevens Magic here in the states that deal with Bar Betchya/Bar Magic as well as improv & impromptu type routines. I think most of these features legends like Tom Mullica, Mark Kornhauser, Bill Malone, even Charlie Miller and Mike Ammar. If you can't find them through Stevens contact L&L in that its some of their earlier work.
So now we come to that Mentalism thing. . . you will have worked at least a year + on the above which is a decent primer -- a foundation upon which you can build.
Get yourself a copy of Elliot Bresler's SWITCHCRAFT it will be the best investment you can make in this genre, in that it gives you a growing collection of material using the most innocent of tools in the Mentalist's arsenal. You can cultivate a religion with nothing more than this skill and having a solid grasp on Cold Reading.
13 Steps to Mentalism and Annemann's Practical Mental Magic are the "bibles" to this art form but might be more than you need, given your described vision of things. Nonetheless, I would suggest that you pick them up and take your time going through them. You will likewise benefit from the Karl Fulves "self working" titles.
Depending on your sense of confidence and understanding of language work, I'd put the original PSYCHOLOGICAL SUBTLETIES by Banachek on this foundation list in that this technique has become a new standard to our work. You might likewise enjoy the "SAFWAN PAPERS" by Bryn Reynolds in that it's a bold method that can be applied to several different situations and too, it gives you a great bit of fun when it comes to an old classic. If you find that you like this particular routine you may want to save your pennies and get THOUGHT CHANNEL from Jerome Finely; it's a two volume set that gives you more options around the same effect but again, the methods can be applied to other scenarios.
Needless to say, this gives you at least another Year + worth of honest study.
While I'm just now finishing another of the FREE pdf project I've been working on over the past two years that deals with the SWAMI device (a tool used in Mentalism) I do have two such treatise that may lend to you some insights when it comes to what Mentalism is really about, the links are below;
MENTALISM: Introduction & Resource Listhttp://www.lulu.com/product/ebook/mentalism-introduction-resource-list/15574606?productTrackingContext=author_spotlight_767346_Learning to Cold Readhttp://www.lulu.com/product/ebook/learning-to-cold-read/17796796?productTrackingContext=author_spotlight_767346_Best of luck!