QUICK bike tune up advice needed!

[Geonz]

Yea, that (at least once) was me! And I learned it *again* last week when my HOkeySpoke made a little clicking noise, and I thought, "oh, I'll look at it when I'm done [unless I forget which I will]..." until it was making those big "clicking" noises of banging on everything, and I had to stop with its spoke broken.
Clicking noises, things rubbing... STOP. I promise. Really. (Except last Tuesday Rich had to inform me that yes, my Xtracycle strap was wedged between chain and derailleur parts and that was probably why it was jumping around, and I should really stop...) I suppose I'm really lucky the terrain is flat around here.
I switched front wheels; rear wheels would have to have compatible gear thingies.
My friend Clyde despairs at the inconsistent numbering of tire sizes. I figure it's like dress sizes - the more it costs, the smaller size you wear, only with whatever factors count for bikers.