There are ways to top, trim, fim, prune, whatever you want to do to a plant. Many strains lend themselves readily to this kind of treatment while others do not. I don't like to top or interfer with the plant until around the 8th node just to ensure that I have established a good root system inwhich to feed the new growth you are going to be producing. Plant health and vigor starts theres, I know lots of other things but the roots are the starting point.
Word of advice before you top or whatever, have you decided what you want your plant to look like when its done? Two or four main branches? Many buds sites with a lower canopy? This statement will get lots of different views but here is mine. If you are new to growing overall, not to mention our girls I wouldn't do anything the first grow. The more budsites, the smaller the container the more attention and balancing you are going to have to do to keep your girl at her peak throughout the grow. You can top and other things to a plant and produce more bud sites but until you learn how to grow a plant and what it needs and when, you are not going to know what the plant is capable of.
Right now the simplier you keep things the less stressed you will be over your plant during its grow. Just my two cents, but I also would be learning to take clones off of this girl and then go wild. This way you have guided the first plant through a cycle and know more about what it wants nutewise and such. I think you will find that doing this your multi-cola plant will do much better for you.
Good Luck and Welcome to RIU