is it good to be obvious to a girl you like?

Well you want her to know dont you?

I think a lot of girls secretly want boys to be straight forward with them and say things like, "I like you," or, "You're pretty." About the questions, just ask questions about her, like what's her favorite colour, or something like that. Keep the attention on her.

Tell her, it prevents confusion down the line.

I like this girl and I have never been big on the 'tell her you like her' stuff, but I am now. I now don't know (but I am guessing she does) if she knows I like her, I don't know if she likes me back and the answers to those questions constantly change in my head, it confuses me so much.

Please tell her, you don't want to be in the mess I am now.

Be courteous and clear. Ask questions that need to be answered with more than a yes or no.