It is always hard right at the start to build a portfolio. What do you want to shoot? Who do you want to shoot for? Think hard on the next question - what is the assignment that you want to be doing, and later look back and tell yourself it was all worth it?
style is pretty hard to define, but a strong style is one which is your own and few can take it away from you.
I have seen part time photographers who spend more time composing and thinking through their shots than full time photographers, and the effort shows.
You can take a look at my site.
www.stefenchow.com
The simple story was I started with the Everest portfolio, and that was my first body of work. I had to figure what I wanted to shoot down the line (being in Singapore, it was hard to imagine anyone funding you to shoot mountains in the Himalayas) . It wasn't easy, and I took a lot of hard knocks, ego bruising, and somehow managed to come out alive.
I hope I have developed a certain style over the years, but it is something you do after being inspired by others and continue in your persistence to shoot and learn.
Good luck! It will be a pretty exciting journey.