Well, there is a lot to this.
The first thing I would recommend is try running the db migration wizard from Microsoft
http://www.microsoft.com/sqlserver/2005/en/us/migration-oracle.aspx
And take a look at what it scripts out.
How many stored procedures do you have in Oracle, triggers, sequences? these are all going to come into play in terms of how complex the migration is.
Do you need to migrate data, if so how much?
That's just for starters, if you are looking for a forum post that tells you step A, B and C you are out of luck.