I always like Fran Sands' videos for technique.
I can't post url's but you're looking for "myboxingcoach" with Fran Sands, or the myboxingcoah channel on youtube (no it's not a plug, I just find his stuff very thorough and informative).
Also, look up "online boxing timer" and link your pc up to a set of speakers for a free interval timer.
Buy yourself a speed rope.
Good pair of running shoes.
But yeah, totally what the other guys said. I'm a beginner too, nothing beats having a coach, all of these things are no substitute for the real thing.