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Multiple LED wiring - help! Answered

I am not to familiar with wiring and leds and recently have taken an intrest. My desires however are hindered by my lack of wiring knowledge. For a project I am working on i wish to have either 12 or 24 leds. I have read that a series/parallel matrix might be my best bet but I dont know how to go about setting it up. I dont know what leds to choose or what resistors are needed. I also want them to constanly change color but dont know how to do that either. This all needs to plug into a wall socket. If anyone can be of help I would greatly appreciate it!