I want a nose job but my nose basically has no shape, what are my options?

Every nose is different and unique to that individual. If the appearance of your nose concerns you enough to do something about it, it can be improved with a natural artistically performed rhinoplasty. What would be the best option and exact procedure would depend on an in person examination (not just an online consultation) and discussion about desired outcome. Excellent results can be achieved with either a closed or open technique.
 
Keep in mind that following advice from a surgeon on this or any other website who proposes to tell you exactly what to do and how technically to do it based on two dimensional photos without examining you, physically feeling your tissue, assessing your desired outcome, taking a full medical history and discussing the pros and cons of the operative procedure would not be in your best interest. Natural appearing results need to be individualized and what is appropriate for one patient is not necessarily the best for someone else. I would suggest that you find a surgeon with extensive rhinoplasty experience certified by the American Board of Plastic Surgery and one who is ideally a member of The American Society for Aesthetic Plastic Surgery (ASAPS) that you trust and are comfortable with. You should discuss your concerns with that surgeon in person.

Robert Singer, M.D., FACS 

La Jolla, California

From your photos, it looks like you a great candidate for rhinoplasty. A well performed rhinoplasty can reduce the overall size of your nose some and give a better defined tip. It all starts with a consult with an experienced rhinoplasty surgeon where you can undergo computer imaging to give you a better idea of what you make like...

I would recommend starting with a consultation with a board certified facial plastic surgeon that specializes in rhinoplasty surgery to discuss if rhinoplasty can address your concerns. 
I would recommend writing down the following questions before scheduling your consultation:
1. Are you unhappy with the tip of your nose? 
2. Do you feel that your nose is too wide? 
3. Do you want to make your nostrils smaller in appearance? 
4. Are you looking to decrease the general size of your nose?
I hope some of these questions will help you pinpoint what it is that you don't like about your nose.  Cost will vary due to various factors like anesthesia fees, facilities fees, etc. I wish you the best as you research your options when scheduling a rhinoplasty consultation.
Sincerely,
Philip J. Miller, MD, FACS Double Board Certified Facial Plastic Surgeon