Sci fi is a bit of a broad genre. Is there a particular area that interests you?I write general sci fi and military sci fi, but by and large, my published work is military sci fi. 200 pages you tossed? Ouch! I'd try to get a complete short story or 3 completed to help get your feet wet. Writing a novel is well and grand..but finishing one... You can always go back to your short stories to flesh them further out, heck you may later find a character in there that demands a full length book! On an aside, I'll say its probably easier to sell a short story/novella than a full length book. That will get you your name out there and make future works easier and make YOU more marketable.
Some general rules
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READ UP on finding and acquiring a good, trustworthy agent, editor and developmental editor.
Contract with a legal professional who specializes in author's rights to help secure you financially.
Acquire a thick skin to survive and accept withering criticism and cultivate a masochistic love of rejection.
Learn YOGS LAW. Apply it to ALL your transactions!!!
Avoid vanity publishers/printers like the plague!!
Ebook publishing is cheap and won't make you rich but, might get you exposure.
Resources
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School may not teach you how to be a great writer, but it WILL teach you some skills you may find valuable for later.
BUT!!!!
As a student you've already got a wealth of resources available to you already:
your professors
your fellow writer peers
english majors
for review, testing the waters with a story try
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wattpad.com and other similar sites
for getting into the profession try reading up
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http://www.writersdigest.com/ <= GO HERE
http://www.sfwa.org/ <=GO HERE FOR SURE!
http://www.sfwa.org/other-resources/for-authors/information-center/
http://www.marketlist.com/
http://www.sfcenter.ku.edu/other.htm
Some good books on the creative process
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The 10% Solution, by Ken Rand.
Writing to the Point , by Algis Budrys.
Zen in the Art of Writing: Releasing the Creative Genius Within You, by Ray Bradbury.
Writing Science Fiction and Fantasy, by Jeffrey A. Carver
World Building, by Stephen Gillett.
The Science of Science-Fiction Writing, by James Gunn.
On Writing: A Memoir of the Craft , by Stephen King.
Beginnings, Middles & Ends, by Nancy Kress.
Booklife, by Jeff VanderMeer.
Writing and Selling Science Fiction, many authors and editors, published by SFWA.
EDIT: Sorry this post is all over the place.