Práctica con "para" (Part One)

[laepelba]

I have been working on learning the different uses for para y por. (I am not asking for help with that - I have found several good resources for that, including here on Tomísimo, thanks to Dave!)

I want to start trying to write more of my own (originally created) sentences so that I can practice using my new palabras in context.

Here are some of the sentences I wrote. More will follow (eventually).
1) Estoy estudiando español para hablar con gente en la Ciudad de México. Voy a visitar allí en mayo.
2) Practico la corneta francesa para tocar mejor.
3) Necesito hablarte para explicar mis comentos.
4) Llevamos placas de nombres para identificarnos como empleados.

Please tell me (a) if the use of "para" is correct here, and (b) if there are any other issues with the sentences of which I need to be aware.

Thank you!!
Lou Ann