|What country are you in?
In the US, anything you buy FOR RESALE you don't pay sales tax on. The end-user pays sales tax. For example, if you buy a frame to display a print (in your studio or living room) you pay sales tax. You buy a frame for a print and sell that to a customer, then that person pays sales tax.
Any vendor will have a form for you to fill out showing your 'tax exempt status' so they don't have to charge you sales tax.
In Pennsylvania where I am photographic services are taxable as is photographic items (prints, albums, frames, buttons, etc).
You state will have (probably online) a list of what's taxable and what's not, and what that tax is (amt), and when you pay and to who.
I pay quarterly, oct 20 for the third quarter ending sept 30. I can file via the internet or a phone, and i can pay 4 different ways. I collect 6% but the state only collects something like 5.94 - the difference is my 'fee' for collecting their tax.
service or product...it's all the same here in PA. If where you are they are taxed differently then you have to decide how much of each is what - for example, a wedding package of $1500 includes 8 hours shooting and X hours processing, an album and some prints. You might say the album and prints are $750 and the 'service' is $750.