Steps to migrate SharePoint site 2007 from one server in to another server.
please help me in advance.
Is a much longer story but here is my take as preparations: Q: Are you interested in the content only (take content databases) or also replicate farm and services configuration (security accounts, web applications, shared services, service pack level)? Are you planning a new server or existing server (go for X64 already if you can -gets you closer to SP2010)? depending on those questions you need to perform
As I said, is more than that, but at least should get you started in reflection and planning