2. Use some lube, because why not? McCombs recommends using a quarter-size amount of lube onto your index and middle fingers and gently massaging it around your clitoris (the little button-shaped thing at the top of your vagina) and inner labia (the folds inside the larger folds that make up most of your vagina). Sure, you might have enough natural vaginal lubrication to start with, but if you don't, extra lube (no matter where it comes from) will make it a lot more comfortable.
3. You don't have to focus on the vagina and nothing but the vagina. Carol Queen, PhD, co-author of The Sex & Pleasure Book: Good Vibrations Guide to Great Sex for Everyone, recommends also bringing in nipple stimulation into masturbation, or grabbing your butt or upper thighs, just to see if any of that feels good to you. Part of that is just to get a sense of where you're the most sensitive and what kind of touch feels best for you. Plus, by finding those spots on other parts of your body that feel really good, you're increasing your arousal, which will make touch feel different (and probably better), which is always great.
4. Don't feel like you have to start out by jackhammering your clit. McCombs recommends some more low-key playful touching, like running your fingers along your inner labia and along the sides of your clitoris, all the way down toward the entrance of your vagina. It's just a good starting point to get some blood flowing down there, which helps increase pleasure and arousal. Plus, you're getting a feel for what you like and you can always keep repeating whatever is working for you from there.
5. You can use a vibrator, but you shouldn't necessarily start with that. Queen says that while you might have a better success rate with a toy, using your hands in the beginning can be a great way to learn about your body. Plus, it's also more comparable to the sensations caused by a partner's hands, so if you have any interest in partner sex, it'll help you transition from one to the other more smoothly and gives you information for your partner about how you like to be touched.
So, what are you waiting for? Go for it, because you're all ready!