The actual rental cost per month obviously depends on the property itself, but you have to consider you may also need to pay business rates, electricity and gas, along with property insurance and repairs if the contract is tenant repairing. You'll also have a deposit up front, which could be sizeable.
You can get small business rates relief if you qualify.
The lease will agree the terms- length etc, but be aware, if your business is relatively new, you may have to guarantee the payments personally, which, if you trade through a limited company, will negate any protection you have through that.