Do not buy a business without having the sale Notarised at the nearesr Notary Office. Non-Notorised business sales may not qualify for tax concessions and fare badly in any disputes. Ensure the town hall will allow your chosen premises to be used for your intended activity. Never proceed without a professional, unless you read and can understand Spanish documents. Make sure professionals you use, really do understand their job.
Many activities are new to Spain.
It is not more complex operating in Tenerife than any other country. The above list simply provides a comprehensive overview of the 'important details' which all of us business people should be aware of. Difficult' might be the wrong word, its just that there are some business activities I simply would not want to create, the bureaucratic problems could be almost infinite. Its perfectly possible, once you know 'why' something may be difficult or costly to do, to modify your ideas and come up with a variation, which achieves the same thing more easily. If your idea involves trading on the beach, and your foreign to Spain - forget it.