Please tell me the minimum number of coin required to stake.(or what is the optimum number to stake this coin).
How we receive thw POS reward for this coin, whether it is daily, weekly or monthly
The optimum is as many as you can get!
Don't think there is a minimum but a very small amount will obviously only stake a small reward. I'd guess a few tens of thousands is a decent starting point.
There is no set frequency of payment; what you see will depend on how many coins you have in your wallet, the age of the coins, and so on, but staking rewards are granted with every block, and paid automatically to your wallet. Newly staked coins require 30 blocks to mature.
Newly moved or staked coins need to have aged for 5 days before they will start to stake.
To take an example of, say 100,000 coins:
In an ideal scenario 100,000 V will earn 60,000 V in interest per year (ignoring the interest in the interest).
So if you had your wallet open 24x7, 365 days, those 60,000 V would be earned at about 164 per day.
