One to two week trip from Thailand

Hi, I'm travelling to Thailand this year and will need to do a visa run out of the country at some stage.

I'm looking at visiting PRC for 1-2 weeks so will use the
run as the opportunity to do this, I may or may not also visit Hong Kong so just to cover this what would be the best type to get and what would the price be please? Do I need to provide evidence of accommodation on arrival and a return ticket to Thailand with the application.

Kind Regards
Nigel