There is so much to know/learn... always, because the hobby is constantly evolving and there are so, SO many aspects to it. I'm not great with expanding on general questions so I highly suggest reading these.perfect, thank you so much. Anything I else i need to know/buy?
Provided the glass isn't tempered of course.
Either Craigslist or see if your LFS deals with used setups. A used reef ready setup would save you lots of money (I went this route with my 90 gallon, my LFS found the setup for me). Be sure to check for scratches and leaks though. You don't want a tank that looks like this:I definitely want a reef tank. After seeing those pictures, I was like 'and why am I not doing this?'
Where could I get a pre-drilled tank? Is craigslist a good option?
Most people start of with dry reef rock and sand but it is acceptable to use live rock if you take the proper precautions but I recommend going with dry rock since it really is the safest way for a beginner to start a tank.