Depending on the state you are in, you will have to pay sales tax to your state. In my state it's 7%. So if you sold $100.00 in goods you owe the state $7.00. Also different states have different rules. In my state if I pay early I can deduct 2% of the total, so on the $100.00 I would only have to pay 5% or $5.00.
In addition, you only pay sales tax on the items that are sold within the state. For instance, I hardly ever pay any sales tax to the state since most all of my sales or out of state..
Most states will send you a 'tax package that will contain your payment coupons which will have you tax number and name already filled out. All you basically have to do is enter the amount of sales (sales that you made within New YorK)then the amount of tax, and so on. It only takes a minute. Usually states will set you up to pay either monthly or quarterly. If you have not had any sales within the state that tax period, (monthly or quarterly)then you just enter '0' tax and mail the slip in the printed envelope they normally provide..
As far as going to an accountant, well that's just something you have to decide if you want to do it yourself or have someone else do it.
But don't get personal income taxes (state and federal) confused with paying sales tax to the state..One has nothing to do with the other..
State sales tax is a tax that you pay monthly or quarterly to the state in which you are doing business, on the gross amount of sales you did within that particular state during the tax period...
Personal state tax (and federal)taxes are taxes that you pay on personal income. (that is, for instance, on the profit that you made from your business...It's usually just paid at the end of the year at tax time.
Most folks that I know that are just doing a small 'sole Proprietorship' type business on the side, normally just report the income on a 1099 tax form along with their regular income. I personally just bring all my stuff in to the lady who does my personal taxes and she just charges me a few extra bucks to do the extra...
If you normally do your own taxes, then do them for your business too, if not just take it to whomever normally does your taxes...