If you want to know more about a guy or a girl while on a date, you need to ask more questions. For example, there is an example here https://ask.fm/dating/personal-questions-to-ask-to-get-to-know-someone.html. I recently met a guy and I really liked him, but these questions helped us understand that we are very different and we have different goals in life and plans for life.
Well, you can give them a small gift, it's a good way to show that you like them and also find out if you're on the same wavelength! Some jewelry or pendant can be cool gifts, I recommend checking out shungite pendants, they look very cool: https://shungite-c60.com/product-category/shungite-pendants/shungite-geometric-pendants-emf-protection-assortment/