Concur, if you have never worked with MT before tis a bit of a curve but do not deviate from default settings for the most part unless you know the ramficactions.
Best is to continue to read and absorb knowledge so that you can ask questions.
Also I believe the L09 series recently has a path to upgrade to arm64 from arm32.
Hopefully others will chime in on how to accomplish this, or is it worth it!!