There shouldn't be any extra liquid in the raisin mixture but if there is, drain it, so the dough doesn't get too sticky. Then mix the raisin mixture into the dough by hand or spatula. Since the raisin mixture is a little moist, the dough might feel a tiny bit sticky. Just keep shaping it and kneeding it in your hands or in the bowl until it forms a ball. The more you work it, the less sticky it gets. We usually don't add flour at this point. But if you feel you have to, sprinkle in a small amount by hand and shape the dough some more before adding more flour. If you add too much flour, you could dry out the Stollen.
Put the dough ball on your unfloured work surface. To ensure that the raisins are mixed in properly, kneed the dough for about 2 minutes.
IF YOU'RE ADDING MARZIPAN: Shape the dough into an oval. See the section in the post with photos and a link to a video explaining how to add marzipan. IF YOU AREN'T ADDING MARZIPAN: Shape the dough into an oval. Then, use a knife and slice the top of the dough lengthwise about an inch deep to give it the traditional Stollen look. Photos are provided in the post. Lightly cover with plastic wrap and let it rise for another hour. It will get a bit bigger but won't double in size.
Before baking, press any exposed raisins into the dough. Otherwise, they will burn. Then, bake at 350 F for 30-35 minutes until golden brown.