Somewhere in there value needs to be included. The number one goal when picking up a girl at a bar is for her to find out that you have value.
Value can be many different things but some examples are being the alpha male of your group, having a very lucrative or appealing job, you being a very good boyfriend/hookup, etc. When a girl is judging if she wants to hook up with a guy or start dating a guy, the number 1 thing is that they are trying to judge if you have value.
The issue then becomes how can you get a girl to see your value. There are varying ways of making it happen. Let's use the value example of you being a great person and a good hookup.
The strongest way of her finding out is a trusted friend tells her. This is often the case if you two have a mutual friend. The next is that one of your friends or really anyone unknown to her tells her. There are varying levels within this as the girl is inherently forced to first judge the source, as this comment is a lot stronger coming from another guy she deems valuable rather than your friend with the 'creepy' vibe. And the last one is of course you just telling her straight up, as often this comes across as bragging. There are other ways to show you have value without being direct about it, such as telling a story that subtly provides information or having her overhear a conversation between you and someone else.