You should buy two things to get started. An ASIC and a moderately cheap PC.  The idea of your early mining should be this.  First, ignore the huge, established coins.  There is simply no way that a normal person and/or household is going to plug anything into their wall and start churning out actual Bitcoins.  There may be a trickle there that seems like you have hit the bank, and then the electric bill comes and you have gone backwards.