I am new to the game and I need help with approaching at bars. I am not really afraid of going up to a girl and introducing myself so that isnt the problem.

The problem is that I dont know what to say after I approach. I typically say "hey, I thought you were cute so I wanted to say hi". Mind goes blank after. This happened twice and I stopped approaching because it was awkward as hell.

Any good guides or tips to get a conversation going?