Need help on facebook marketing

I'm new to facebook marketing and I want to start in cpa. Is there an application that can automate posting messages in group walls. For example, I have links of facebook groups/fan pages but I haven't joined yet? Is there an application that can let my accounts join or like the group/fan page and post wall messages? Please help. Thank you.

best for cpa is facebook ads

but i don't have the money right now, since ppc requires some plenty of money. I'm looking for a tool that will help me in facebook marketing as a start.