If you prefer, you can just pour the mixture on a suitably sized tray, let it cool and firm up, then cut it into desired shapes.
I used this cute but inexpensive
chocolate flowers silicone tray mould, and
hearts mould (for U.S. flowers option, click
HERE, and for hearts, click
HERE).
Keep it refrigerated in a sealed container. Or store it in the freezer for a firmer texture.
Metric kitchen scales are an inexpensive yet invaluable gadget to enable accurate measurement of ingredients. Store them upright in a cupboard or over your worktop and they'll only take up a tiny bit of space. Click
HERE for the ones I use (UK Link). For U.S. option click
HERE.