[DIYbio] Designing primers for PCR

Hi everyone,



I'm trying to design primers on my own. but now there are a few questions that Google couldn't answer me. 


a) are primers single stranded DNA or double stranded?
All results from Google don't say anyhing about that. It's just like, everyone who writes thos pages knows, but it is too obvious to be mentioned. 

I would strongly assume they are double stranded? 


b) 
I got Gene 

ATG-AAA-NNNNNNNNNNNNNNNNNN-TTT-TAG

If double stranded Iwould just have to write down the sequence: 

forward primer:
NNNrestriction - ATG - AAA    

reverse primer:
TTT-TAG-NNNrestriction.site 

Correct? (Not considering melting temps yet!)

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