I know I look like I'm 12 in my pic, but I have been doing this for a while! Hopefully you will find some of this helpful! As far as personal branding About 7 years ago when I first got in, people used to put their pictures in the local paper to let people know where they are at and what they are selling.....my how things have changed! At this time I would recommend using twitter, facebook, tumblr, etc to help you build your brand. You need to be where the eyeballs are and everyone is online. Rather than rant on this for an hour, ill recommend you pick up the book "crush it" by Gary Vaynerchuck. It will show you the path!
Finding your niche in sales is often times a tough one but once you sell a few cars, or whatever it is your selling, you will know what you did that worked. Or possibly you will notice a certain demographic you have a lot of luck with. Use that to your advantage. When I first started it seemed like a couple would walk on the lot (I was in my early 20s they were in their early 40s) The husband thinks im a kid and dont know what im talking about, but the wife thinks i look like her son, lol. Use it to build rapport and humanize yourself and you will win every time. I knew that my strong point wasnt selling trucks to hard core truck guys because they knew more than I did at the time about the product. I did find my path selling new hyundais to college kids, young couples, single women, and business men looking for a work car, because I could relate to them and understand they wanted. When you understand and listen to what they want, you can suggest what it is that will satisfy that particular need.
Lastly, if you want to stand out to your customers, be genuine. In everything you do and say. Customers run into too many "typical car salesmen" anything you do that comes off as being even remotely human will get their attention. Being a woman, I would imagine your going to have plenty of success in this field. Men are easily influenced by women of course, and women oftentimes feel more comfortable dealing with someone of the same sex rather than a man. Just don't waste time B.S ing with the guys you work with! That's an easy way to get your managers attention in the wrong way, when you could be easily getting their attention making the sales I hope you are in the future! Best of luck!