For a start, I think it is ok. Just try to improve the coding so it wont look very messy and disorganized.

Please use this for your abilities, it will look less messy:

[columns]
[nextcol width=100]
[center][icon=prowl size=64][/center]
[nextcol width=30]
[nextcol width=620]
Passive: Prowl/Hunt
[color=black] [/color]
Prowl: Moving through brush increases Nidalee's movement speed by 10% for 2 seconds, which increases to 30% if she is moving toward a visible enemy champion within 5500-range.
Hunt: Hitting enemy champions with Javelin Toss and Bushwhack will mark them as Hunted for 4 seconds, revealing them. While moving toward Hunted, Nidalee gains Prowl's bonus movement speed and ignores unit collision. Additionally, Nidalee's first use of each of her Aspect of the Cougar abilities against Hunted will have an empowered effect.[/columns]

It will all be a lot nicer with some columns. Use them in every chapter.

Be careful of using pictures. (masteries) Use white space to prevent text floating next to your pictures.

Read these:
General
BBcode
Columns

You're off to a good start, hope you'll complete it soon.


Best of luck,

Foxy

Really nice guide.