I fully appreciate your need to find a meaning and direction for your life rocky, but i don't think an idealised notion of a partner and a baby will be what you need.
As has been pointed out, having a child is not a reward for passing a 'maturity' test. There are plenty of young couples, and even more single mums, who are seduced by seeing pretty babies pushed in prams in the sunshine.
Trust me, it is really not easy to create and care for a human being, it is a serious commitment, and financial security and a stable relationship - the two items you should have in place first - simply aleviate the basic difficulties involved.
I think the advice of a job in child care is very sound - you can find out how really suited you are to parenthood - it's not for everyone, and I do think that this notion that you have that it will make you fulfiflled is someting you have not throught through, and I know from experience that the reality is a long long way from the dream.
Concentrate on finding a job you enjoy, and a partner you can settle down wiith, and maybe then you can both look into the sommitment of a child - but don;t think it is a cure-all for your current feelings of rootlessness and misery - it is not.