Corporate aviation, especially on newer equipment is not a time builders haven. Most corporate flight departments require higher times than airlines, few will pay for your rating, and most expect time on type as well as previous VIP Flight dept experience. You might get into an older Citation or the likes as a P2 to start with, on a low salary and with few benefits, but if you decide that Corporate is what you want to do, then stick with it, the good jobs are out there. Also, don't think of it as a stepping stone to the airlines, you will be very disappointed, it is a different career path and although many pilots do switch between the two, allot go back to their original plan.
My advice would be to get some time instructing or flying TP commuters before risking money on a Biz-Jet type rating without a job offer, furthermore, do the type rating at P1 level when you have sufficient experience, it makes your financial commitment worth a lot more.