Fatshedera is a cross between ivy 'Hibernica' (Hedera helix) and Japanese fatsia 'Moseri ... You can either buy a trellis or DIY a garden trellis with items you already own for your fatshedera ...
To ensure flowering, let the Ivy grow and provide it with support, tie in to trellis and lightly prune ... The transformation of hedera helix from juvenile to adult form is a remarkable example ...