Self Improvement Made Easy

I am a 28 year old lady, and recently started thinking of working on my self-imporvement. I figured it is good to start with the way I look – like keeping my nails done, thinking of color balance of the clothes I wear etc. I also started thinking abt health which encouraged me to join the gym and smoke less. Do you have any ideas of good ways of self-improvement? I feel I need to become a better person, also people who look nice and are positive and nice to everybody, tend to be more successful in their life. If you have any ideas of what areas in a person usually need improvement, and more importantly, the ways how you can become a better person, please drop a note! Thank you in advance.