It's wonderful that you have started an outline! This is the NUMBER ONE thing I recommend to every writer. Remember though, although you have some major events, the little evens count as well. Where there is a rising hill there must also be a declining slope. Make sure you have the ultimate climax too. This should be the point where you're main character either faces the bad guy (or girl), overcomes his fears (maybe in a battle), etc. It should be the point you have been working up to. Seeing as you're is a love story, this could be the part where the character proves him/herself? You probably already know this so I'm not going to ramble on the possibilities...
Chapters are what breaks the storyline down into sections. There is a range of pages per chapter, meaning it really depends on how long you want it. I don't recommend one page chapters however. Normally you want to space it to around ten pages or more. The most important concept in chapters is there must be a problem and something must happen to it. Either it is solved and they continue on the exploit the next obstacle, or it gets worse and they must try harder still, or they fix it only to find a new problem, etc. This does not always have to involve a fight scene where someone dies... it could be an emotional problem or a fight in someones mind. Also, you must trust what you as the author thinks. If it does not seem to flow right, you can change it.
Okay. So you want to find the "balance" of dialogue, description, conflict, tenderness, etc. Like any story, there isn't a fixed amount of this. They aren't like ingrediants in the cookbook of novels. You want it to sound natural however. Try closing your eyes and picturing the scene. How should the characters sound? Depending on the situation really is a factor to this. I don't think there will be much tenderness in a vicious battle scene. (Who knows though; surprise the world!)
Seeing as you have already composed an outline, you should be able to clearly see where a fight will take place, what happens, and a rough idea of what they should say. Make sure what you put in flows right. Nothing should really be in the story (other than detail) than doesn't protain to the plot. As in don't go off on a tangent on the pretty butterfly by the lakeside...
Continue with your outline and make sure you don't begin writing unless you know exactly where you're going and how to get there. Unless you are some prodigy on writing (if you i envy you), it is a bad idea to "make up along the way". And NEVER delete anything in your outline. Personally I don't write a chapter by chapter outline. I just jot notes down everywhere :[ which tends to get quite disorganized. If I scribble anything out i might need it later so...
And when you begin writing don't stop! It might seem discouraging but dont give up! Happy writing!