Reinstall Win 10 Latitude e6320

I think it is time to reinstall the OS.  This laptop seems a bit sluggish compared to others.  I have concerns, however, because I do not want to turn this into a Brick.  Maybe someone can help with suggestions or point to good site to read..

Q1:  Checking setup, I see this E6320 is set up for Legacy Boot.  Okay? I thought I would see about changing to UEFI, but got error msg that  file system not enabled.  I guess I am stuck with Legacy Boot.

Q2:  I am concerned that I will have all the needed drivers since I do not have factory disc.  There are 10 drivers listed on the support page.  2 are Bios that I already replaced. I guess Win 10 has other drivers needed?

Q3:  I have read but still confused about all the install options, i.e., "Fresh Start", "Reset", Re Install, etc.  What do I really want to do to clean my computer, put a fresh OS on it.  reinstall whatever drivers and software that I need?  I did download a create Win 10 DVD install disc.  

Any suggestions would be appreciated.