I have been reading how good it is to start a 401k early. My job offers it and they match what i will put in it. I work full time but I might be in this job for only about 6 months is it worth starting it or not?

Maybe. If you have credit cards, student loans, or a car payment, it's better to pay those off instead, then start the 401k after that.

Sign up now! Put 15% in each payday. Pick a variety of funds and re-balance once a year. This is how you build wealth.

Hell yes. The match is free money. You can roll

it over into your new jobs plan.

probably not since you won;t be there long enough to get vested in the matching funds - you can start an IRA

Yes, of course.

I strongly encourage to do so, it will be like you putting twice since they match. Do it.