We need to use ADAM as our asset repository with Tridion 2013
what all we need to start with?
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The first thing you need to sort out is an ADAM license of course, then you should contact your SDL Web sales/account manager for obtaining the license and software for the ADAM Web Service and ADAM ECL Provider. These are custom parts delivered by SDL, allowing you to create a connection between the two systems.
Then from there just follow the documentation as @Raj suggested, you will automatically get to the topic of creating the required certificates and it is explained where to place them.