Want, Need, Must & Have To
A1istemek, lazım, gerekiyor, -malı/-meli + ve, ama, çünkü
WANT - istemek
istemek means to want. You already know the present continuous, so you can use istiyorum, istiyorsun, istiyor... for everyday wants.
Want to DO something
To say I want to go / I want to eat / I want to learn, Turkish commonly uses the verb with -mak / -mek + istemek.