online marketing

Before the crisis in the real estate industry, I was a real estate agent for a real estate firm here in Georgia. When the crisis came, I quit my job and just put up a small business online. It is a garments business. I have to work so hard and raise my three kids. I am a single mom so I want to be more for my kids. One time, I saw a good opportunity online and the real estate industry is getting back on its track. The real estate business is now coming back for good. I applied for real estate agent again. I was amazed that most of the firms now have an online marketing effort. What are some inexpensive tools that real estate agents can use to track their online marketing efforts?