k theres loads of things u can say relating to how to play Telemann fantasias. Telemann cleverly suggests
keys and chordal structures within the solo melody. As someone already said, ye the first section should be free, but make sure it doenst seem as tho u cant keep in time cos i keep doing that!. U can use articulation for echoes when Telmann repeats phrases, ie a softer, lighter tounging the second time and a shorter, accented effect the first. Telemann often goes back to a low note in semi tone sections, so linger on this note as it comes every beat to really bring it out, (like a drone underneath)
The 1st fantasia has a kinda fugue section (starting with the 4 spiccato crotchests). It comes back after 2 bars in quavers, (anc again 4 more times)with a countersubject alternating, so bring out the first quaver of each beat whenever this "fugue" appears.
If you need to breathe in long semiquaver passages (i know i do!) then just pull the tempo back so u can make the breath natural.
I dont reli know if any of that made sense to u!!