Action Details
Requirements and how-to articles for Steam's action:

Requirements
You need this to get it done:

Application Files
The product(s) that you wish to distribute on Steam.
App ID
A unique ID which represents your application.
Product Submission Fee
You must pay Valve a $100 USD fee for each product you wish to distribute on Steam. This fee is not refundable, but will be recoupable in the payment made after your product has at least $1,000 USD Adjusted Gross Revenue for Steam Store and in-app purchases.
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How-To Articles
A list of useful links for you:

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Steamworks Documentation - Applications
Information about different types of applications which can be distributed on steam.
Official
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Valve Developer Community - SteamCMD
Documentation for SteamCMD.
Official
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Steamworks Documentation - Steamworks SDK
Documentation for Steamworks SDK
Official
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