As you are not already in rented accommodation, you will need to be assessed by your local authority as in need of housing before you can receive rent supplement. If you want to do this, apply to your local authority immediately to be assessed.
Getting 185 Euro from work will reduce any Jobseekers Allowance payment by approx 75 Euro. You did not mention if you were in a relationship or your age, but assuming you are single and 25 or over, and have just the one child (and no other income or savings/capital) then you would receive approx 142.80 Jobseekers, plus the 185 income from work, which would give you a combined income of 327.80
Because of your income, any rent supplement will be reduced by approximately 28 Euro. There is also a minimum contribution to rent that you have to pay which is 24 Euro a week, so basically you would be expected to pay the first 52 Euro a week of any rent.
If you are single, then you should consider applying for One Parent Family Payment rather than Jobseekers. You would lose less of your social welfare payment, but would lose more off any rent supplement. If you are a lone parent, please confirm and i can do the sums.