How do you get a girlfriend?
First of all, why do you want a girlfriend? Are you interested in her as a person, or is it your sexual drive talking? Very few people that I know like to be seen as a target or a goal, they want to be valued for more than what they have between their legs.
I don't know how old you are or anything about you, but if you wanted me to be your girlfriend, for example, you would find out what I am interested in. You would also have interests of your own. You would know enough about what you like and what you want out of life that you would be looking for someone who shares those interests and values. You would take time to get to know me and allow me to take time to get to know you. You would be a confident person, not desperate or clingy. You would respect yourself and respect others.
You mentioned seduction. I want a man who is as interested and as passionate about getting into my MIND and my HEART as he is my pants. Seduce my mind, intrigue me, arouse my curiosity so I can see what you have to offer (other than the purely physical).
That is how you do it.