In international removals, customers are worried about packaging, transport, the destination partner ... and take the administrative steps in the background. Outside are the most important formalities and especially those which are up to you to do everything. For the necessary documents to destination, it depends on the country and so they will be indicated to you during the elaboration of the quote. But there are mandatory documents for all countries which are:
1) Photocopy of your passport
2) Certificate of Moving (ask your consulate or town hall) OR a letter from your employer stating your dates of start and end of contract in the country.
3) Detailed inventory of belongings and their value.