So, you have your visa stamped and you have booked your tickets. That means you have to... start packing!
Start your packing at least two days before departure date. Buy two strong bags - they should be able to withstand a lot of mis-handling. They should be as large as possible within the size limitations (however most airlines are not very strict about baggage size). Put identification marks and labels both inside & outside the bags (apart from this, the airlines will also provide you with adhesive labels). Bags with independent top & bottom are preferable.
Bag specifications, as an example the Air India economy class baggage specifications to the USA are given below. Note the specs. may be different for other countries/airlines: