The easiest and quickest way to start is to establish a trade license. If you are located outside of Slovakia please follow the rules of your law. In case you want to start with a Slovak trade license here is a detailed summary of the steps you need to perform:
If you are ready to make a big career change and you do not want to terminate your trade license after the first year we recommend to establish LLC right away. The process is more complicated (we are happy to assist you) but from the tax optimization point of view it is for sure a better option.
Either you decide for a trade license or LLC, we recommend to use one of the companies which are specialized in establishing of trade licenses or LLCs. You will save lot of time and in some cases it is even cheaper than doing it by your own.