Go ahead and try. You wont get experience by not doing. Don't get frustrated about failure (it's only temporary).
Joe's idea about three "Novella's", flipping between fronts/nationalities (please, not in order) is a good, and original idea.
Have the entire story (front to back) in your head before you start. If you don't (semi) conclude chapters, it will smell of run-on.
Make an outline.....follow it.
An old saying...."Writers write, others think of excuses not to."
Ray Bradbury writes 10 pages a day.....every day
The majority of Publishers are Women, keep this in mind.
If you fail miserably, you may still, (link is screwy, just type it in.) win...
http://www.bulwer-lytton.com/
(read some of this stuff....it's Hilarious)
Above all, have fun. After all you're doing it to please yourself. You will get better (IF) you keep at it. Save your old work so you'll be able to quickly see, how much you've improved. Then throw it away because you'll know what and why it "Stinks".
A rejection slip (or a thousand) will find you....So what?
Happy Trails ! 