Hey there, jmpovr.
Usually you don't have to do anything prior to running the cloning software. When you clone a drive basically the program copies everything sector by sector (along with the files system). However, I've heard of issues (regarding detecting the new SSD) with not initialized drives sometimes, although that might have been a glitch of some sort. Initializing a drive is usually necessary when you get a new internal drive for secondary storage and the process consists basically of selecting which partition table to be used (GPT or MBR). When cloning, this should be done automatically in order for you to end up with the exact same drive as the source one.
You could also take a look at this guide on how to migrate your OS...