You should take a look at the terms and conditions of the company you are getting you reseller account from too as you will probably have to have all your sitesd meeting there conditions as well as your own.
It is best to get permission first. It can probably be considered a copyright violation if you simply copy someone else's TOS.
With that being said, feel free to base your TOS off of ours. Keep in mind that you will probably have different policies than us. Please do not just copy and paste our TOS, but you can have ours open and be reading it when writing yours.
Note: We are not a reseller, but I don't really think it matters. TOS's are usually pretty similar all around.