Lense Adapters For Canon 50d Lens Reverse Adapters And Extension Tubes?

Lens Reverse Adapters and Extension Tubes? - lense adapters for canon 50d

Well, well, I'm just a beginner with all these ... I will be able to reverse adapters and extension tubes on the use of my Canon 350D and my 58mm lens?

Who is better for macro shots?
They are worth?
How do I pay them?
How different they are against the objective standard?

I am a student and I can not really afford to get a good macro lens.
I'd love to hear your opinion about one of mutual adoptive and / or extension tubes.
Thank you ..