There are 2 different ways to book Scottish salmon fishing, one being with a professional salmon guide to give you the best chance of success or simply buying the salmon fishing access on its own.
When booking salmon fishing in Scotland it is advisable to engage the services of a professional salmon fishing guide who will supply all of the required salmon fishing equipment, tactical fishing tuition, seasonally appropriate salmon river access (& flies) and will make sure you're fishing over the correct salmon holding areas of the river on a personally dedicated guide service basis to you or your group. This is a completely different level of service than what you can generally expect from purchasing salmon fishing access on its own in Scotland with the exception of a few very high end salmon fisheries.
Salmon fishing access on its own is generally a waste of time without the above unless you're an experienced salmon fisher with the correct equipment & tactical awareness levels as not all salmon beat resident ghillies have the time or inclination to dedicate themselves to a full instructional personally guided day and especially when they have other guests and riverbank duties to attend to. Also, not all salmon beats carry a full size range of waterproof jackets, chest waders or general fishing equipment for hire or flies & lures to give out to guests either which are all essential items for your fishing trip. Follow this link to book a guided salmon fishing experience in Scotland