Forgive me for saying so, but how can you claim to 'want to be an MP' when you don't know what an MP does?
An MP, if he/she (let's use he for simplicity) is a bankbencher, ie, without a cabinet post, does essentially two things: one, works to resolve any issues/concerns of his constituents; if someone needs help getting through layers of civil servants, or needs to get grandpa's veterans benefits straightened out, their MP is the go-to guy. Usually, an MP will have a staff to help do these things. The other function of an MP is to work on legislation put before the house, to read and understand the bills, to help craft the laws, and also to ensure that his constituents are informed about new regulations, programs, etc, and to help people access these.
Often, MPs will also sit on committees, either ones dealing with the House and its function, or dealing with various functions of the government. These committees have their own extra duties, involving meetings, etc.