Act mature. Women hate immature guys. They will not go out with you if you keep making potty jokes or dirty jokes.
Maintain appearances. In my experience, women don’t like slobs. Be clean and hygienic. Don’t overdo it though because she’ll think you’re a neat freak.
Be nice. Care for her. If she needs something, do your best to get it for her, but act cool about it, you want her too see you as boyfriend material, not someone she could employ to do tasks for her.
If a situation comes up, defend her. This will show that you care and want her.
Don’t try for sex. You’ll look shallow, immature and desperate.
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