ZergKing

Greetings Newbie here, well I use to be decent at the game but that was like 20 years ago and I'm looking to get back into the game. Hoping to play some old maps like v3 rashowdown, hjk6, p4 etc. This game was amazing for it's time.. great memories playing on westwood and mplayer back in the day. Where do I get started as a noob? Are there any guides, what hotkeys should I use etc.? Any other tips? Cheers.