Don't worry about the fluid, that is a secretion of different chemical compounds that the plant releases to deter pests, and encourage water-retention. Here is a short blurb on the stuff:
http://www.growingfo...n-tomato-plants
As far as the bumps, don't worry about those. All of my tomato plants get them on the main stem, especially near the roots, and those bumps will turn into roots if the vine/stem touches the soil for extended periods of time, or if it is buried.