about freight

i am the trader of cement bearing a valid gst number.since i a
m the trader of cement i have to deliver the bags at the residence of customer ,for that I am charging freight and shown in the invoice separately ,and I have my own vehicles and I registered as cement trader only
my doubts are
1). whether I need to collect any taxes on freight ?
2) or it is to be included in sale value as per transaction value provisions ?
please answer

thanks in advance