1. If you are new to shopping vintage ,make your first purchase something that works with your existing wardrobe and doesn't require too much thought about what accessories you may need. A 60s coat is a durable piece that will stand the test of time and always look chic.
2. Always buy pieces that are in good condition. You may see heartbreakingly beautiful dresses that need some TLC, but finding thse missing buttons or bugle beads can be impossible annd repairs can be extremely expensive. 
3. If you find a dress you adore but the fit isn't quite right, gentle tailoring can yield wonderful results. Just don't change the nature of a dress too much. 
4. Keep your vintage clothing modern and don't play dress-up. Always pair a great vintage find with contemporary accessories or separates so that you look tremendously stylish rather than like a Mad Men extra. 
5. While vintage can provide you with clothing for all walks of life and times of day, it is by far the best way to find your perfect LBD. The classic new look of a tailored waist and fuller skirt is brilliant for all shapes and sizes, but if you prefer a cleaner , more modern take, the 60s A-line style is a winner.