These are usually simple errors in the code that MUST be fixed in order for the computer to take any commands (enter playmode). Therefore you must fix exactly what the error says in the script, but considering you are brand new to Unity and scripting I assume, I would start learning JS or C# to have a solid base in programming before tying to dive into making a game. You need to understand what these errors in the codes are, rather than trying to collect various scripts from tutorials and the web, mash them up in attempt to make a game, because some scripts will not correspond with each other, and its best to write the scripts on your own, so you understand exactly what the errors are and you will fix them with ease. I know you are excited to dive right into development, but my advice to you is to start learning JS or even C# so you have a solid base and understanding of scripting.