All the issues he has volunteered as to how he will resolve issues. His solutions for defeating ISIS (such as the invasion of both Iraq and Syria and committing violations of international law) and the immigration issue are both unworkable because they both would require support from Congress, drastic changes in law (including a constitutional amendment or repel of the 14th Amendment).
Most of what he wants can be done under existing laws.
You are picking on one or two issues that may or may not be done. Just like any other Candidate.
Immigration Reform
Deportation of the 12 to perhaps over 20 million undocumented immigrants will all require judicial deportation hearings. The courts and prosecuting entities do not have the capability to perform that function in a timely fashion.
The only law that could be enforced that would be feasible budget wise is the enforcement of labor hiring laws and increased penalties required by legislative action to put employers in prison and fine them into bankruptcy for illegal hiring.