As a single dad who has brought up the kids since about age 8 to almost grown up – I’d say that you are in a great situation and very lucky!
How do you know you are bringing up any kids alone after birth? Anyway…it’ll be hard work, but you’ll have the chance to be close to your son. It’s probably best not to worry about money too much – just make sure you have plenty of time for your son/ kids.
No doubt you’ll need a break from time to time, so Grandparents, friends, a good baby-sitter can all help…before long he’ll be going to nursery or half days at school – they grow up quickly, enjoy!