[ubuntu] Need recommendations for dual boot

Hello everyone, I am Ibrahim Jaffar.

I need some recommendation from this community guys. Currently i am using Window 7 operating system for my Lenovo laptop. Now i want to use Ubuntu OS with my current opearting system. How can i do that :confused:

I have 50 GB emply space on my harddisk for Ubuntu opearing system. But i don't know how can i install this to my laptop:(

Please help me out and give me some recommendations. If anyone provide me some screen shots that would be better to understand for me :KS