I bought a 2 GB Sandisk card for my BB pearl today. I seriously need help on how exactly to get ring tones(that are on my computer, and internet) and themes from websites onto my phone. Any help is appreciated. I'm sure it's in a thread somewhere but i couldn't find it. Thanks in advance.

Here you go... pretty much everything you need to know:
Adding Themes & RingTones - BlackBerryFAQ

and
How do I add media files to my microSD card? - BlackBerryFAQ

Thank You