At first I saw this chart on verbs: http://oasis.fortunecity.com/labreya/147/verbchart.html and then I started to look at others and came to this one: http://www.epochrypha.com/japanese/verbs/verbs.html .

Now, I'm horribly confused. It appears,all the forums of verbs can be used 20 different ways, instead of the single way the first chart shows.

My other problem is neither chart shows what the changing of the base actually accomplishes. Like, "Kaku", if I make it "Kakoo", what does that do and what am I suppose to add afterwards?

I might be getting bogged down in with all the different context so I'm wondering if anyone can explain it to me, or if there is a completed chart with examples that're easier to understand then these.

I'm really confused, any help would be appreciated~ ^_^

And this is why people should learn in classes and not by themselves.

Each verb has a different meaning even if the base is the same. It's like in English where "to run" is your base and you work from there to give a sentence specific meaning.
I ran in the park.
I am running in the park.
I will run in the park.
I did not run in the park.

Because I'm not about to write a huge page on Japanese verbs, I'll just quickly answer your question and leave it at that. If you're really inquistive (or desperate), feel free to message me. But, either way:

Kaku = to write. It is the plain verb form and the basic building structure to figuring out how to get to other versions of this word. The basic "to write" verb form is kakimasu. But you learn "kaku" so you know how to write other versions relating to the verb "to write".

Kanji o kakimasu = To write kanji.

Kakou = basically it's an informal "let's write" form. The more polite version would be "kakimashou".
I have "kakou" instead of "kakoo" because my version fits better with how it would actually be written in Japanese.

Kanji o kakou = Let's write kanji.

you just have to get used to which conjugation is used in which context. There are several different situations in which kaku becomes kakoo 1)let's write (see response above) 2) someone is/was about to write (tegami wo kakoo to omotteita) 3) what should i write? (nani wo kakoo?) - are some that i can think of.
It's tough to cover everything so start with the basics - don't get too bogged down with the rules but instead try and listen to how people use the language.