for gods sake sai why didn't you say you had those earlier? >....< gimme gimme!
Monster, you have a pretty good advantage on 'theme' so what you need to work with mostly is style.
Light novels are supposed to be quick to read, terse/brief in their sentences. The target audience is generally teenagers and if i remember correctly the kanji uses a very loose form as compared to regular literature.
Yes, reading light novels heps tonnes, so make sure you focus.
I noticed in light novels things are loose in terms of punctuation e.g
"Hello!!!!? Are you blind?!"
(and the famous pregnant pause) "..." (is allowed.)
(Or even ) "!!!?" (to show surprise. This makes things really fun and easy to work with, dontcha think?)
Also, dialogue is a main driving force. Do not forget the dialogue. It's used to help add content to the story, as descriptions are cut down.
A light novel is generally 15000 words long. Light novels are meant to be serialized so they're chapters are nice and short, and there is always a volume after the first.
Finally a light novel is related to the manga/anime genre by illustrations! They can either be full paged illustrations or small sketches at the corner of a page.
Hope this helps