I am a beginner at playing the guitar, so I recently bought myself one and then managed to break a string whilst trying to tune it. After getting over the initial disappointment, I have ordered some strings on-line. I have a few questions which I hope to get answered in relation to changing strings

1. Do broken strings damage the guitar in anyway and is it recommended that I remove the broken string before the new ones arrive.
2. Do I have to replace all the strings or just the broken one.
3. What tools/resources would I need apart from the strings, considering that I am a complete beginer.
4. Any suggestions on what kind of strings to buy.

Any help is greatly appreciated ! Thanks in advance :)