mayi, wats ur expertise? is it marketing or chemistry/science?
u must first ask urself whether do you like shift work? most cpy nowadays are adopting 12hrs shift, basically working straight 12 hrs everyday (could be 8am - 8pm or vice vs) for 3-4 days and then rest 3 days. You will have no "life" during those working days as you will be exhausted after work. As for your rest day, 1-2 days might be spend trying to rest.
There are many types of allowance. For eg, if u r working shift, there's shift allowance (range from $500-$1k plus, depending on the cpy), transport allowance, meal allowance, medical allowance, etc (Note: not all cpy will provide all these allowance).
i'd tried shift work when i first started working and i do not enjoy it. 1st of all, i'm tired most of the time, my rest day is spend sleeping or lazing at home. 2ndly, family time is lesser as i need to work during wkends (hence u might have less time for ur bf as well). of course there are advantages to shift work