Do I have to create my own skin? Or may I use ones on skindex? On top of that, how do I start to roleplay? Im a little overwhemlmed

Nice to meet you!!!!!!!!!!!

Hello! I'm extremely new to this stuff! I grew up watching roleplays on minecraft youtube and always wished to do it! I am used to doing text based roleplays and the only other game where I have roleplayed was roblox when I was very young! I'm now finally 18 and ready to try and do what I wanted...