Ok , first off , I'm either reading/understanding this very wrong , or Rona has it very wrong .
If you are attached on the 14' side , then that would mean your deck will run 20' out into your yard .
If this is correct , then the way I see it , Rona has it all wrong !!!
Or did you state it incorrectly in your first post ?
You say that Rona has sent you
16pcs @ 2"x8"x 14'
4pcs @ 2"x8"x14' ( you say for beam)
2pcs @ 2"x8"x8' ( also for beam )
Looks to me like no question that this is a materials list for a deck that is 20' across the house and 14' out into the yard ..
IF... this is to go 20' out into the yard , then that changes things BIG time !!!
If I were you , I certainly wouldn't being doing a single thing further without getting a LOT more answers and understanding .
__________________
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Was a highly motivated person...
...stay lazy my friends 
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