You can t use bread yeast. They re very different. Brewing yeast comes in several forms. The most common are liquid, and dry. Using liquid yeast is a little more involved, and beginners generally start with dry yeast.
Liquid yeast is also more expensive.
Intermediate and advanced brewers will use liquid. To use dry yeast you simply pour the yeast into about cup of warm water and let it sit for 5-10 minutes. This wakes up the dormant yeast and gets it all set to ferment your beer. Modern dry yeast is generally hearty enough that you can even skip that last step and pour the yeast directly into the fermenter. Starting the yeast is some warm water definitely accelerates the waiting process.