That's certainly too much volume per muscle group for someone new to training. Over time, such a routine will be easy, but not right off the bat.
The single best thing for muscular soreness is the cold - ice packs, ice baths are ideal. I'd stay away from heat even if it feels good.
As for stretching - only very light stretching at this juncture. Don't strain yourself with hard stretches, it will only delay recovery.
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