Tools depend on the system you are working within. However, in ceremonial magick, the most basic tools are a knife/athame, and candles.
Some systems, like Golden Dawn, also require a wand.
Candle colours are, again, dependant upon the system you are working in. The Golden Dawn, for example, has a very long list of colour correspondences, and almost every form of witchcraft has something similar.
For basic black magick, black candles are the usual, but really, any colour can be used. In Works of Darkness, EA recommends three colours, black, red, and indigo, and in his book on baneful magick, he provides curses that use yellow, brown, green, and blue candles.
Black candles are a good start, though, and you can get other colours when they are needed. I have evoked elementals, demons, and angels, all with the same sky blue candles, though, because they were all I had, so don’t stress overly much if you can’t find a certain colour.