If you are registered or planning to take a registration then the replies are as follows:
1. Yes, you very well can send goods within your state if you are an unregistered person.
2. No.
3. RCM is payable eitherwise. But if the goods are not returned within 180 days then it will be termed as sold and gst shall be payable on the sale amount.
4. Obviously, not being registered is the simplest way.
I appreciate you understanding that its a vast topics with so much to discuss plus so much on our part to understand what the clients intends to say. So it will be better if approach any professional and have a telephonic or personal discussion to clarify your points in a better manner than the question answer way.
Trust this clarifies your query.
Feel free to call / get back in case of further clarifications.
Thanking You.
Regards,
Rohit R Sharma
BCOM, ACA, LLB-GEN, CERT. FAFP