Gladly i will.
Yes, indeed -chan addresses a girl formally, but not specifically girls, mostly female. -kun addresses in the same manner to a boy.
-san is a more common way to address a person, usually with the same significance as almost anybody else would have.
-chi, less commonly used, is addressing a somewhat newcomer to a certain group, such as yourself.
sama's a respectful way to address an elder person, or someone with higher significance than you. say, like daft. since he's admin, you'd address him as "daft27-sama". Dono's another way to show respect to an elder, but with a little less significance.
In complience to the one above, you have instructors/teachers as well. You'd address them as "sensei", which is common throughout students.
Now, you see other things, like student-to-student relationship. Pretend you're an underclassman, below me. You'd address me as "hamasusuke-sempai", and usually i'd adress you as "paganini-kouhai" (not directly, though.) This is more in an academic level, where senior students help out junior students, though it's wierd when junior students kiss up to them XD.
then there's -shi. shi addresses an unknown person, usually in a writing. say you don't know me, but you address me in a writing (not directly though), so you address people as shi.
There's plenty more of member titles. you can address family using member names (like bold-nee-san or something). But it's very less common to hear on the streets, yet you hear a lot of it in anime, just to show that there's relation. Addressing -san is common above all.
all those are common when addressing a person. now, addressing the right person is tricker. for example, if i was your older brother, you wouln't adress me as -aniki. Aniki is more of a "possession" word. you wouldn't call me aniki directly, but more as "That's my aniki doing my homework (in other words, your brother is doing your homework)".
Instead of addressing that, you'd address your brother/sister as nii-san or nee-san.
that's all from me for now. if you need more help, post again. there's a lot more to address people besides using the japanese titles. you can wiki it, if you like; it's more detailed than my explanation.
i'm gonna keep this topic pinned, just in case a question like this comes around again.