When it comes to planning your signal chain, there are usually a few rules of thumb to follow, but at the end of the day, experimenting with different combinations is also fun and it can yield sounds that you were not expecting and end up wanting to use. With fuzz pedals, it is generally a good call to place them in the very first place of your chain. They have simple circuits but they're very finicky. If you place a buffered pedal before a fuzz, it can change your tone drastically, which is why most people use their fuzz pedals in the very first place of the chain.