[Koha] how could i change in the view of the records in OPAC

i need to change the sequance of the fields of MARC record in normal view in opacand add new fields to appear in the opac in the normal viewcould you please tell me how could i do thati reached to that i need to change in /usr/share/koha/opac/htdocs/opac-tmpl/prog/en/xslt/but i don't know which file also i need to know how could i remove MARC view & ISBD view in the opac Mohamed El ZalabanyIntegrated library systems consultant Zalabany Knowledge Systems Team© For Libraries and Information systems Development and support mh_zalabany@hotmail.com Mobile: 0111291444