Welcome to the forums.
I have fired decals onto commercial pottery and most results were good but you do need to know if the piece is earthenware, stoneware/porcelain or bonechina as the glaze chemistry for these categories of pottery are different and may change the colour of the design on the plate or the decal as the glaze softens and starts to activate again. All metal accents on a piece will permanently tarnish or burn out completely because the layer of metal is so thin, ditto with lustre colours and porcelain painting because these colour films are also very thin.....
....having said all that, decals are great fun and will fire onto most china most of the time with very little trouble because the firing temperature of the decal is much lower than the glazes on the piece.
I am Australian so I think metric.... my firing schedule is...60C/hr to 150C to thoroughly dry the decal, 120C/hr to 570C hold 10mins, 120C/hr to 810C hold 10mins, off.
Would also suggest doing a test piece first. Good luck and show us the results.