Different airlines have different regulations for how much baggage you are allowed to check in - check with your airline before travelling.
Check with your airline if there are any additional costs for taking oversized baggage.
Check with your airline how much hand baggage you can take with you on board.
Name and address label on both the inside and outside of bags
Do not forget to label your bag, preferably on the inside as well. If your baggage is misplaced, you can mention that there is a name and address label inside the bag, which simplifies identification.