Breast Pump

Can anyone please help me.....

I'm a first time mum and I am so confused I want to breast feed but torn between bottle and breast.... I would like to breast feed but don't know what the best pump is ... do I pump at night will I have enough milk to stock up if my partner wants to feed my baby so confused is it hard work to breast feed I need help honest help

what is the best pump ?

when do I express is it all the time ?

can I used formula at the same time as breast milk ?

do you have to warm up breast milk when you expressed it ?