Replying to Aggressive Inline

I want to get a pair of skates, but i basically know shit about this stuff. What skates would be good for someone like me who is like beginner/intermediate (it's not like i've never skated b4, i just havent done THIS kind of skating) Also, would it be a bad idea to get them online? and are the sizes usually similar to shoe size? any answers to these questions would be really helpful.

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*High North Session 4

'I luv you like a fat kid luv cake.' 50 cent

Me: Fo shizzle
Travis (friend): Dude, stop talking Snoop Dogginese.
Me: You're a dumbass