keeping a fair share between me and dp now i've got a job

[MaeBee]

me and dp have both been living off a mix of working tax credits and other stuff. he is a musician and im a writer and we both have other projects, mostly political. we did 50/50 childcare and the same with housework. our child is 2yrs old.
however, i thought one of us had to earn a living cos im worried about rising cost of food, heating etc. i've just got a lovely job, its 18.5 hrs a week, £21,000 pro rata, so will nearly double our combined income.
but now don't know how to do the rest of it! he's a bit worried about losing more free time for his music stuff. i know its very important to him, but it doesn't bring in any money. my writing is important to me too, but im having to lessen it for a little bit.
anyone else been in similar situation? how do you arrange it? i obviously want to spend a lot of my non working time with my child, BUT i also do want to do all my other projects. whats fair?

Will dp be looking after your child while you are working? In which case, I guess you could split the 'working week' so that you look after your child for a couple of days while he works (i.e. does something productive for the family - might be chores if he isn't actually doing any paid work) and then you could share out the rest (evenings, weekends) around your non-productive projects.
I'm afraid most parents of small children have very little discretionary time which isn't taken up with either work or children.

dp will be looking after child whilst i'm working, yep, at first anyway, then in a couple of months we'll try and put him in nursery for the mornings.
i know its true most people don't get free time. we've always been happy to have no cash but more time, but as i get older i guess i want a bit more security! not talking pensions, just being able to put the heating on in the evening in winter and stuff like that. maybe we'll just have to stomach shelfing our projects for a couple of months at least. we're lucky in that the little one is really good at playing independently a lot of the time, so you can get some stuff done. and we've recently given in to dvd's and videos. when you really need time its possible to sit him in front of a whole film but thats an emergency measure only.