is this possible?

Kayleigh
Ok so weekly my partner brings in 600$ (after tax) and I get 100$ each week in family tax benifits 
Do you think it's possible for the two of us and our daughter to move out of his mums house ? 
We know it would be approx 250-300$ a week in rent and then obviously on top of that we need to pay bills (gas water and electricity) and we would need to buy food and fuel and stuff like that...
We are almost 22 and have an 8 month old daughter and another on the way .... we both hate living with his family and we need more room and our 8month old will need her own bedroom soon an it's not something we will get at his mums place .... we litrually love in a bedroom that is only just big enough for a bed for the two of us and a portacot for our daughter....