Transcribing to a new key

[Robenco15]

I got a bunch of Fake books and Real books and tons of sheet music all on a cd. more than 3000 songs probably close to 5000 but they are all in the key of C. i play Tenor sax so i'm in the key of Bb. how do i transcribe them? is there a simple rule like move it up or down so many steps and add a certain amount of sharps or flats?

[madgrocer]

To transpose from Concert C music for Tenor which plays in the key of Bb you need to transpose Up a Major 2nd, or in other words 2 half-steps.
For example Concert C is played as a D on the Tenor.

So if it was a concert C major Scale C, D, E, F, G, A, B C
It's played on the Tenor D, E, F#, G, A, B, C#, D

Another way to think of this is Adding 2 sharps to the key signature.
Key C = no sharps or flats
Key D (Tenor) = 2 Sharps

Key F = 1 flap
Key G (Tenor) = 1 Sharp -- you added 2 sharps.