I'm really disappointed at the sexism on this thread, a lot of what's been said wouldn't be if the genders were reversed.
I think maybe get married first, wait a year or 2, marriage is a good legal protection for lots of reasons, weddings need money too and much easier to organise without a little one, and it would be good practice financially for you both if you spend that time living on just your wage and you could save his.
My ex and I did this and meant my not earning after having dd wasn't such a shock.
Babies aren't expensive (excepting childcare), we weren't financially badly off but still didn't spend much (only things we bought new were travel system, next car seat up and high chair plus new mattresses and bedding for cot and Moses) we were given an awful lot either as barely used hand me downs (got a ton of clothes barely worn and some never worn from a friend who's 5th and last dc was her only girl!) or gifts.
Even if I DID have the money I personally think it's nuts to put eg pre schoolers who are going to get messy in expensive clothes - plus they outgrown every month!
Babies are relatively cheap - it's teenagers you need a lottery win for 
As for your dp, he sounds fab! I'm seconding (though had thought of it myself before reading but was surprised it took 4 pages!) The idea of your dp being a childminder or similar. Several mners have male dp's that are and I know a couple in ral life too, it seems to be much sought after. Maybe being an early years worker when yours reach school? He sounds very patient and relaxed type. Also liking the music tutoring idea. He can start locally till he can get the driving sorted. BTW there are driving instructors that specialise in nervous learners, I used one (had been in a bad accident when younger and was a nervous passenger let alone driver).
Good luck with it all.