First thing I would suggest would be too try out a few DAW's to see which one you prefer, most have a trial version and will let you play about with it a bit to see which one you prefer (I use ableton live but everyone is different)
Once you have picked one watch loads of tutorial videos on how to do different things on the DAW and how to work your way around it, when your first starting its just getting yourself used to the DAW you are using, also would suggest buying an intro version at first just to make sure you like doing it (no point in splashing out loads of cash in something your only gonna do for a week or two)
Then when you know what your doing then start thinking about what equipment you need to buy e.g. soundcards, monitors, MIDI keyboards, samplers etc etc again think about things you think you need rather than you want (no point spending £100s of pounds on something you don't have a clue what it does but it looks cool)
Then just take it from there and have fun!