2. file to INS to get a tax ID #, also need file with them if you chose a S.,
3. Regist your biz at you local gov for you sales or useage tax if apply to you.
4. file and pay property tax monthly,
5. file and pay local tax regularly,
6. file and pay your federal income tax yearly,
7. file and pay your state income tax yearly (except few states like NV or FL)
8. do good book keeping for all your income and expenses during the year.
and Good luck