A: You are allowed to travel within the U.S. if you have been approved for DACA.
At the checkpoint at Sarita, Texas, you will need to present the DACA EAD and the un-expired DACA approval.
Do NOT cross the international bridge between Brownsville and Matamoros unless you have an un-expired DACA parole document.
A: As a U.S. citizen, you can file the FORM I-130 for each of your parents. If your parents lawfully entered the U.S. then the FORM I-485 can also be filed with USCIS. The U.S. citizen petitioner will have to also file the FORM I-864 with the adjustment of status process. If your income is insufficient then you will need a co- sponsor.
An experienced and qualified immigration attorney can assist you with this process.
A: You must be unmarried to be eligible to file the FORM I-129F petition to begin the process for the K-1 fiancée visa. After the petition is approved by USCIS and the K-1 visa is issued by the U.S. consulate and your fiancée enters the U.S. you can then marry. This process will generally take more than 6 months.