I want to be a software developer. Where do I begin?

i would really like to learn how to program and develop production-ready software. i would like to begin with PHP and either concurrently, or subsequently, learn python. how do i begin? the purpose of my learning is firstly to be able to personally work on developing features and apps for my e-commerce site which is based on joomla (it was developed by professional developers).. the second purpose is that i want to be able to apply for software/web developer jobs eventually because i'd like to work in that field.

i don't know if it's relevant but i'm currently using a windows machine, and i've often heard from people that windows is a terrible environment to learn programming and to program in. is it necessary for me to get a mac or linux machine?

and to reiterate: where do i begin to learn how to develop production-ready software, i.e software that is ready to be shipped? i've done codecademy and similar stuff before which seems really simple and easy, but i can't figure out how to translate that "knowledge" from those sites into actually writing something useful and "shippable".