I was making some polymer clay items, so I took photos to show the process. I'll go through the process for polymer clay, but this will work exactly the same for gumpaste.
The cutters that I used are from Sugar Art Studio, which has a lot of good specialized cutters for specific flowers.
Cut out 7 of the longest petal and attach them to each other in the center. Make a snake of tinfoil and form it into a ring. Place that on top of the petals to support the next layer. If you're using gumpaste, moisten the center of the petals with gum glue before attaching each layer.
Make the next two layers of petals the same way as the first, with a shorter petal cutter each time. Alternate the petal placement so that they don't sit exactly on top of each other.
Add one more row of shorter petals and press down the center with a ball tool to firmly attach the layers of petals together in the center.
Using a small cutter, cut out three petals and attach them together in a Y shape.
Press the center of the three petals into the center of the formed succulent and attach firmly by pressing down with a small ball tool.
If you're using polymer clay, bake the succulent according to the instructions on the clay. If using gumpaste, let the succulent dry for at least a day before removing the tinfoil. If the gumpaste isn't dry when you remove the tinfoil supports it can make the petals sag, so don't remove it if that happens. Leave it supported for another day to make sure it will keep its shape.
Kara Buntin owns A Cake To Remember LLC in Richmond VA, and cake supplies online at www.acaketoremember.com and www.acaketoremember.etsy.com