How do I protect and market my code?

Basically I had a over the summer assignment which I used to develop a piece of software which I guess will sell around 50 - 70 bucks a copy.

To make this clear. The final code is in Java (a requirement).

Now I was think about marketing my little creation however I'm faced with two problem:

1, I need to provide full documentation to the Lecturers. How do I go about preventing them from stealing my code/methodologies used? Would simple copyright be enough?

2. How do I bundle the software? How do I sell it? Should I partner with a publisher or should I just sell the code to a software company? I will need bi-yearly maintenance at least.
How do I protect said software from getting cracked?

How /prog/ has some experience on this already!
Thanks for helping out!

>>3O

Op here. Thanks for helping. It's not that I'm egotistical but rather; I paranoid. Anyway, others still are telling me that protection is a waste of time so leave that alone.

How to I sell my little creation?

Do I like create a simple website and make it available from there?

Do I partner with a publisher?

Or do I try to sell it to a software house?

I guess the a software house would be best cause I have no intentions on maintain my code, however I'm worried I'll lose a lot of it value if I do so?