Does anyone know, because I'm clueless, any good sites/articles/columns/videos or have any good advice on how to mod pedals?
well.. do you know how to solder?

look up a tutorial on soldering and desoldering. maybe learn a bit about identifying resistors/capacitors, and their values.

..and what pedal(s) do you want to mod?
i bought these 2 really cheap pedals from danelectro: FAB distortion and FAB echo and i was thinking of changing them, just the dist. because its sounds like a shit and I like the echo but i was hoping theres a way of making more of just a reverb then echo. they both have a simple construction set up so i was thinking on starting with them.