A person can spend tens of thousands of dollars on setting up a photography business, pretty easily. Cameras,computers,lenses,space to work in, cards, forms,contracts, etc,etc. But consider this: Photography is writing with light. Light is what makes pictures. One of the things that makes a person appear to be "a professional" is professional type lighting equipment. To the average person, a light stand, and a softbox or umbrella, or a big reflector positioned with a stand and grip arm...those few tools set apart a session that is done with artificial light that the photographer is controlling, from having somebody with a nice camera stop by to snap a few shots. These days, a TON of people "own a nice camera", and a ton of people "like to take pictures". If you want to charge more money, buy yourself a light stand, a recessed face grid-equipped softbox, a 43 inch umbrella, and a single, decent monolight of from 150 Watt-seconds or thereabouts.
The gridded softbox creates a nice pool of light that falls off rather rapidly, to keep backgrounds dark, and subdued. The umbrella creates nice, soft light that spreads over a fairly wide area. You don't need or want a lot of light blasting small animals frame after frame. The stand,modifier, and monolight separates you from all of the natural light photographers, who are, I think, viewed by the public as people who take pictures. If you own decent studio and location lighting, it's easy to shoot good images, which have the needed depth of field, and the control over the lighting that makes professional-looking images. And your clients will refer friends and family, and they will say, "Oh, she brings in lights and everything."
If you look the part, and use one of the real tools of a professional shooter, which is professional-type lighting gear,people will tend to view you as a professional shooter, rather than just some gal who "likes to take pictures". Your lighting gear is one of the very few things clients actually get to SEE. You could be processing on an outdated Dell PC and running Lightroom 3.6....they will never know, nor care.