The context information will help in this kind of question.
볼래 and 필요해 mean two quite different things.
볼래: from the root form 보다: see, look, try. It is also used as an auxiliary verb.
- 이것 볼래? Do you want ot see this?
- 이렇게 해 볼래? Do you want to try it this way? 하다: do; 하다+보다 = 해 보다: give it a try.
- 저쪽으로 가 볼래: I'll go try that side; I'll try going that way.
The same form 볼래 is used to mean either one's intention or a question. So the "?" or intonation is crucial for understanding the meaning.
필요해: I need (it).
- 나는 네가 필요해: I need you.
- 도움(이) 필요해?: Do you need help?