You also will need to file certain forms to fulfill your federal and state income tax obligations. The forms you need are determined by your business structure. A complete list of the forms each type of entity will need can be found on the SBA website. You can also find state-specific tax obligations there. Some businesses may also require federal or state licenses and permits to operate. You can use the SBA's database to search for licensing requirements by state and business type.
obrt: ≈ sole proprietorship; several types: slobodni, vezani, and povlašteni obrt (free, tied, and privileged proprietorship registered according to profession; tied and privileged proprietorships are those only master craftsmen can register,) paušalni obrt, obrt-dohodaš, obrt-dobitaš (flat-rate proprietorship, income tax p., profits tax p.; these are registered according to the type of taxation; first two are obligated to pay income tax and the last one is obligated to pay profits tax), sezonski obrt (seasonal proprietorship, that runs for a limited number of months during a year)