You definitely need a traditional tea set (for aesthetics), else simple teapot will do.
Order of sitting
Male elder on the right, female on the left. Groom and Bride also the same. So you will end up with Groom facing male elder, Bride facing Female elder
Parents first follow by the eldest in the family tree (grandmother, grandfather etc). The order will be from most senior to junior which includes your own elder sisters or brothers.
If there is anyone younger than you, then after serving the tea (and collecting the angbao/gifts), its time for both of you to sit down and be served by the younger sisters/brothers.
You can chose to stand or kneel, depend on your parents