The answer to your first question is that your MHS account will never expire till you follow all the Guidelines posted by Maharashtraspider.com channel. The only condition is that you will get the Adsense Revenue share for only one year. It means if you post some articles on Date: 1 Jan 2012 then you will get the adsense revenue upto 1st Jan 2013.
The Minimum amount that you can withdraw is Rs. 1000/-. But the members need to request the payout within a time frame of one year. The minimum payout can be decided by the webmaster if it is lower than Rs. 1000/-.
The procedure to receive payment is via Direct Bank Transfer and if you do not have core banking account then the accounts department can transfer the payment to your parents banking account.
Hence, to get paid you have to use the invoice system that is present in your profile of Maharashtraspider.com website.
At last the Adsense payment is not included in the cash credits that you earn on Maharashtraspider.com website. The Adsense payment will be sent to you from Google. Hence, you will get paid via two ways one is from Maharashtraspider.com and the other is from Google.
"Don't Worry about Results, Its time to Perform every now and then" - Pravin Chavre.