The idea of dating someone is to find out if the two of you are right for each other. Pretending to be something you're not hinders this process and will likely lead to problems later on. If this is your first time dating a woman, or if you're unsure of your sexuality, say so. If you're in the closet with your family, coworkers, or friends, talk about that once it's clear this relationship could go somewhere. Not everyone is willing to be your experiment, or to be introduced as "just a friend" to your parents. Rough as it is to close the door on a relationship, it will only get more painful if you delay the conversation. Equally, if you've been out for years and your date is more private about her identity, talk to her about it. Learn each other's comfort zones early on. Talk about your interests, and ask about hers. The first few dates are about forming a connection. Ask her follow-up questions ("How often do you go there?" or "What was that like for you?") to draw her into extended conversation. If she seems reluctant to talk, switch to a light-hearted topic to make her comfortable.  Avoid getting too personal. In the early days, it’s not a good idea to go into any dark histories or personal struggles. Save that for later, when a more lasting commitment is on the table. Never talk about your past relationships on a date. It can be hard to avoid mentioning a name if you've been dating a while in a close-knit lesbian community, but that doesn't mean your date needs to hear about your sex life or emotional bond with another person. Honest communication is the most important part of any relationship. This is even more vital if one or both of you are fairly new to same-sex dating (or dating in general), and may have unclear expectations for social situations. Apparently minor etiquette issues such as who pays for the meal can add unnecessary tension. Relax and have a conversation before assuming it's a personal insult.  Don't let the butch/femme dynamic set all your expectations (if that even matches your...

TL;DR in Vietnamese:
Là chính mình. Hãy hiểu đối phương. Nói chuyện về các kỳ vọng của hai người. Giữ lửa mối quan hệ.