I want to ask seniors and expert member that what method should we follow to earn on this platform, after how many days we will start getting payment?
There are several methods on earning through bitcointalk;
- Signature campaigns.
- Bounties.
- Selling services/goods.
Excluding the signature campaigns, there is no minimum forum rank required to take part in. Although, participating in signature campaigns is the most demanded one, IMHO. Usually, the campaign managers hire users who have at least the Senior Member rank. To achieve it, you'll need to have 240 activity points, which is 8.5 months of posting everyday on average, and 250 merits.
You should read more about activity and merits here:
FAQ: Everything you need to know about forum 'activity, account ranks and merit.
This is an overview of such campaigns:
Overview of Bitcointalk Signature-Ad Campaigns