You're making your own speakers? Sounds like fun, but might be more work than you think. When I was talking about bookshelf speakers and a sub, I was referring to bookshelf cabinets that already have speakers in them, which you just have to "plug in" to your stereo. As for the sub woofer...I was referring to a powered sub that is already in a cabinet with its own amp. Again, not one you have to make.
Speaker cabinets usually contain 2 drivers: a tweeter and a sub. Subs in speakers don't drive the bass that a powered sub woofer can, and this is why may people have powered sub woofers, which are seperate from the speaker cabinets. Some speakers are 3 way, which have a mid range driver.
If you know very little about speakers, than it probably isn't a good idea to make your own. And certainly not a 3 way set. They require crossovers, which direct the correct frequency of sound to each driver. As I said, sounds like a fun project and you will learn lots, but I don't think you will get the sound that you are seeking.