You can't really do much with the graphics on a laptop. On a laptop, the graphics are integrated and you can't just slap a Graphics Card in them like you can on a desktop.
Technically you can swap out the motherboard for a different one with better integrated graphics, but it's really not worth it.
Honestly, if you want to get into PC gaming, you have two routes.
1. Spend less money and get a decent desktop with a nice Graphics Card.
2. Alienware Laptop.