I find your question a little confusing. Do you mean that you want to have your baby adopted permanently, or are you seeking foster parents who could care for him/her for a short period of time because you are currently in some kind of dififculty?
You don't say whether your baby has yet been born.
If this is really what you mean, do you not have any close family who can give you the support you obviously need at this time? Talk to your doctor who can probably arrange to put your in touch with Social Services. This is a big step to take and you need some emotional support and counselling to ensure that a permanent decision like this is one you will not regret later.