Probably the most common are the “word groupings”. Here are some:
Lcha anu shira bsimcha rabba. V’am’ru chulam.
Ze keili anu–va’mru
Bal’ma d’vra kirusei. vyamlich malchusei bchayeichon….
Shochen ad, marom vqaddosh shmo (debatable)
qedusha kulam k’echad onim, vom’rim biyira.
As for nusach, unless you’re chasidic, shabbos mincha should be like weekday untill after kedusha…same for r”h mincha.
Kaddish before maaric s”e follows mode of rest of davening…on friday night, kaddish doesn’t have the same tune as the birchos k”s (I think it’s like shacharis of shabbos).
Remember the modes! Kel adon should be in minor.
Make sure tunes are appropriate and fit.