I'm not sure you can have hard and fast rules until you see what happens after the baby arrives.
I am not particularly maternal, never wanted kids and then DH persuaded me that actually it might be a nice idea.
I was fully signed up to Operation Get Pregnant, followed by Operation Be Pregnant and Operation Give Birth - but it didn't really dawn on me that I got an actual real live human being that I was responsible for until after she was born.
Total terrifying shock to the system, combined with an utterly feral mama tiger feeling - I would have killed for DD without a second thought, and was immensely protective.
I very nearly didn't make it through the birth and was in hospital for 8 days, and took a good 5 months before I started to feel in any way properly normal again.
DD then had appalling separation anxiety from 5 months to 2.5 years. Babysitters would not return, family refused to try more than once, even DH wasn't much use. She could scream non-stop for 4.5 hours - probably longer... that was the most we ever tried. Nursery we had to have several goes at as none of them would keep her when she would scream the place down until I came back.
DD also never slept for more than 3 hours at a stretch till she was 4, and dropped all naps by 6 months. We were sent to see loads of specialists on the NHS and the only thing that eventually worked was just letting her stay up till midnight and getting her into an adult sleep pattern (which has never changed yet - she's now 12...)
Having been very career focused, I ended up being a SAHM until DD started school. Once I made peace with that idea (helped by my employer sacking me while I was pregnant - I sued and settlement was enough that I could take extended leave) I absolutely loved being at home with DD... nobody would ever have guessed that, least of all me.
I'm still not gooey over babies, and I admire anyone that wants to spend time teaching or looking after children, but when it's your own child it's somehow different.
With any luck you won't have any of the nightmares I had - traumatic birth, losing my job and court mess, having a completely non-sleeping baby and the separation anxiety issues (now Miss Independence personified), and you may find you can have the life you are hoping for, but I would suggest going with the flow a bit more and just seeing what happens and how you feel at the time.