Since you are new to LoadRunner, have you been able to take advantage of training for LoadRunner web? If not, the place to begin is with the online tutorial for LoadRunner. The type of question you have asked of this forum is addressed directly in both the online tutorial as well as the product documentation. It is covered extensively in training as well.
LoadRunner is not an inexpensive tool. You would be well served to take advantage of training for LoadRunner. I am reminded of a story where an individual who had never been instructed on how to use a hammer was pounding nails into a house frame with the side of the hammer - effective but very inefficient. After training on which face of the hammer to use the efficiency of the worker increased significantly.
LoadRunner, while a little more sophisticated than a hammer, is still a tool.