Slow down... You really need a lot more information before we can help. It sounds like you have no experience and are quite confused. We don't know what you need because we don't know what your project is.
Is it going to be native? If so then you can either use the native SDK or JQM + Phonegap.
Do you need JQM? I don't know, you need to decide.
Do you need SDK and Java and Json.... I don't even know where to begin on this one.
Please try to gather more information and ask better questions, or we won't be able to provide any sort of help.