This completely depends on the context of your relationship. However Americans in general don't require any ceremony nor have rigid social rules. If he does not speak Chinese, then make sure someone is around all the time who can translate and help him find his way around. Help with logistics like transportation, taxis, hotels, food, laundry, and local customs. Even things like bathrooms and toilet paper can be very different for Americans travelling. As for a reception, yeah bring out some friends and peers. Take him to a favorite Chinese restaurant for dinner. No need for ceremony. Try to have much of the conversation in english, or have someone translate everything. Many Americans are pretty adaptable, but the one thing we are stubborn about in general is speaking English. Introduce him to your food and culture, and show him your country, speak english, and he'll be fine.

It depends on the person. A reception may be nice as he can meet other colleagues or it could overwhelm him. Personally, I would just introduce him to other colleagues. I don't think he would assume there will be a reception for him. An small gift may be a nice touch

You might host a reception, but that might not make him "feel at home". Did it ever occur to you that the colleague might be shy? It would be very nice for you to say "Hello and welcome!". Tell your name if you haven't. Tell him who you are and what you do. Perhaps you will have an occasion to sit down and have coffee, tea, or something else to drink and talk to him a little bit about what will happen in the next few hours or the next few days. Give him necessary phone numbers and addresses for some things he might need. Where is he going to live? Who is going to show him around? Who can smooth over any difficulties with language? Will your colleague be physically exhausted upon arrival? Is the first need to get sleep, or to drink or eat something? .