If you are new, it's best not to start with a full adventure path, which is a very large and daunting prospect no matter how simple and straightforward a path may seem. If you want to try GMing, you should start with a one-shot adventure, something that won't take more than one or two sessions at the most. 'Masters of the Fallen Fortress' would be the best choice for this, and it's also a free module.
'Gallows of Madness' is a much longer module, but markets itself as written for "beginner Gamemasters," so it is a good choice as well.
There are also small short adventure paths like what is called the 'Price of Immortality' trilogy, which starts with a level one adventure 'Crypt of the Everflame' continues one with 'Masks of the Living God' and ends with 'City of the Golden Death'.
If your game is a great success and you want to continue playing with the characters, then you can choose another module of the appropriate level and work it into the campaign. Doing this will allow you to see the kind of gameplay that works well for you, and that will give you an idea as to what adventure path might work for you in the future.
I also suggest finding Youtube videos that can help you learn how to prepare and run a game. I highly recommend Seth Skorkowsky; his primary game is Call of Cthulu, but his advise is general, not system-specific.
Good Luck