Consequences of resignation in a limited employment contract

Hello,

I am here on a limited contract of 2 years and I'm not interested in continuing my employment.

My contract states that I'm liable for any "legal fees" for terminating the contract early.

I'm still within my three-month probation period and I am wondering about a couple of things.

Is there a penalty for leaving early?

Do I have to give the standard 30-day notice?

Am I liable for my own airfare home?

Any other information you think would be helpful would also be greatly appreciated.