welcome to the site. you will learn so much here. when i started my tank 10 or 11 months ago i spent a few thousand bucks on usless junk and fish, then i found this site and i now have a thriving 125.
i know it will seem like you are buying things all over again becaus your LFS told you to buy something else but any time you ask the LFS a question keep in your mind they want your money. WE dont. It is a great hobby and look foward to seeing pics and read of your adventure good luck