hi, pls my brother and i wish to travel to dalian from shenyang by bus

The bus tickets are available online. But the official website only has Chinese version. You may ask help from a chinese friend if there is any. If not, you can only buy one upon arrival. Generally, there will be enough tickets left. No worry.
BTW, there are both normal and bullet trains running between the two cities.

tnx so much, pls do u av an idea how long it takes we want to go by bus just to have more feel of the road.

It's about 5 hours.