how can i download rna-seq data sample for starting rna-seq analysis by R? I am looking for an induction into RNA-seq analysis using R. I have yet to decide a data set, or a  subject area. Any help in this regard would be welcome.
You must have found the airway dataset by googling "RNASeq R tutorial"

https://www.bioconductor.org/packages/devel/workflows/vignettes/rnaseqGene/inst/doc/rnaseqGene.html

Why won't this work for you?