u/Inevitable-Value5089

Hi, I'm just starting out I haven't even touched my controller yet, I did just download rekordbox but I can't figure out in what way to import music. Some people say beatport some Soundcloud but do I need subscriptions to use these?, or do I download music online for free?
So my question is where do I find the music and what subscriptions do I need, can I use rekordbox free?