Transfer

I got denied from the main Texas A&M campus for engineering and was offered the Galveston option. I am deciding to attend the University of Houston for 1-2 years. If I want to transfer in the future is it best to apply for engineering at Univ of Houston or undergraduate studies to get basic courses? Is it difficult to transfer into TAMU enginerting from u of h? Are there required courses I must take before transferring? I chose U of H as I live near and can save money from spending on housing. Thank you for reading this and any reply will be appreciated.