Upon arrival at your home/office/warehouse, it is useful to sort books. You can sort by the price paid, location, seasonality, weight or potential profit. We've done a combination of all of the above and find sorting can help optimize processing and shipping.
The sooner you begin tracking information about your inventory the better. The insight will help to optimize and adjust strategy. You can begin by using a simple Note App, Spreadsheet or Project Management Software. At the moment we use Google Drive and Slack to accomplish these tasks.