Costar- the meaning is cost or like how much some one charges you for something.
Estar- is "be" like for example when you say I'm going to "be" at my friends house then "be" would be estar
Ir- means "go", I'm going to go to the beach.
Dar- is "give", I want to "give" this to you.
Recibir- means "receive", Did you "receive" my text?
Sentences:
1. Cuanto cuesta eso?
2. Yo voy a estar en casa de mis amigos.
3. Yo voy a ir a la playa.
4. Te quiero dar este collar.
5. Recibistes mi texto?
Hope it helps, :)