When playing music from standard music scores(again not tabs,music scores! ) I have trouble playing&singing and then keeping on track,i always get lost and screw up my team(other guitar players + piano etc) .

Any song writing tips or lesson suggestion i could search up,to improve my music reading,or memorizing lyrics so I wont get loss so often?

Also I don't know how to read thoese, Coda, swiggly line,bracket things.sorry I dont even know what they're called..... thoese gets me loss the most!!
You obviously need to practice reading more. Maybe get a few graded books on classical music theory, which deals with reading and writing.