1) What is the lamp base suitable for you? --It depends on your voltage.If your voltage between 110v~130v,you should choose E26 lamp base. If your voltage between 220v~240v,I would like to suggest you the E27 lamp base.
2) is it assamble when it shipped? -- no,it is unassambled when it shipped, there is a instruction to show you how to install.
3) How would we pack the chandelier? --In usual,we pack it with foam inside the carton,then pack the carton with wooden crate to protect from damages during the transportation.
4) Any certificates I did? --Yes,I have CE and RoHS,all products were put into test and passed. Please don't worry if you use my CE and RoHS certificates to clear the costoms when you import my prodcuts.