For a huge guide on many matters baroque, the place to look is a flute text, as it happens

! Quantz wrote it, and irritatingly my well-thumbed copy is hiding from me at the moment - so I can't remember the exact title. Something like Principles of Playing on the Flute... it has lots of ideas for ornamentation, also for performance practice of the time, and because it is written in short sections, ideal for dipping into. Music libraries should have it, and it is also available in some bookshops - certainly our branch of Blackwells here in Edinburgh had it in stock some time back. Alternatively the AB text on playing baroque music has some advice. Listening to other baroque music, played by early music specialists, will also help - there are certainly CDs of recorder players playing Telemann, because he's one of our main composers.