You can pay a lawyer to draw up this agreement if you are a large company that has a big enough budget to cover the costs, but this is not necessary as you can do it for yourself. You can of course write out your own agreement using one of the many different templates that are available for download online. Both of these documents are completely binding in a court of law, the difference is the amount of money you are going to have to spend. Each of them must be signed by both parties and in many states notarized in order for them to be legally binding.
Investing your finances in short term things is one of the concepts you have to think through. It's another thing to set it for bigger ventures like properties. When putting money in purchasing properties for lease in the future, you should acquire a tenancy agreement template to model your contract from. The tenancy agreement is a signed contract between the landlord and the tenant. Accelerated possession procedures require a rightly drawn agreement. For claims on housing benefit, the tenancy agreement is essential to the tenant as it will be proof of their tenancy so the contract is beneficial not only to the landlord but for both parties.