Know nothing about law and studying etc with children... but...
DD is 7yo and DS is 13mo, so a six year age gap. It works really well. DD is in school and is old enough to do after school clubs, or entertain herself at home while I deal with DS. She gets herself dressed, gets drinks, in fact she even laid the table this afternoon for lunch, getting everything out of the fridge! It basically means that I'm only tied up with one fully dependent baby. It doesn't help that DS doesn't sleep!
So don't be put off by an age gap. DD loves DS, helps him do things, entertains him, rocks his buggy, chats to him. He absolutely dotes on her and I think her name will be his first word 
However, I haven't found it straightforward going from one to two, probably a bit because of the age gap and we're back with buggies, nappies, weaning. I find that now, DH and I deal with one child each so neither has much downtime and we don't have much time together (like we did when we were both with DD). I would need DH to do way more than 50% care of both children, to enable me to study, on top of DH working.