How do I go to Shenzhen Luo Hu from Jordan MTR ?

Hi, I am a Singaporean and am going to Hongkong in November. My hotel will be near Jordan MTR. Which is the fastest way to LuoHu by east rail line. Shall I take the mtr to Prince Edward station then change at Kowloon tong to Luohu OR take to Tsim sha tsui and change to east rail line via Hung Hom. Which way is fastest and what is the fare and how long is the journey ? Do I need to apply China Visa if I am Singaporean? Understand at Luohu station there are many shopping complexes. Do I need to go through immigration if I just want to shop at Luohu station only if I am not going to Shenzhen. Understand at Luohu station will be very crowded, Pls advise is it convenient to bring children there.