You do the import & move operation to get all the images into whatever folder structure you want to use (your only option at this stage is one of Classic's date-based folder schemes). Once the images are all imported, you can start the process of organising the images into the appropriate collections, using either static collections or smart collections. The basic process for static collections would be:
1. Create a collection in the Collections panel.
2. Use the Keywords List panel to find the keyword that you used which relates to the collection you just created, click on the right-pointing arrow at the right-hand side of the keyword.
3. That will populate the grid with all the images that have that keyword.
4. Cmd+A to select them all.
5. Drag from one of the selected images (from the image, not the grey border) and drop onto the collection in the Collections panel.
6. Repeat for all the others.
7. Later, if desired, you can organise the collections into Collection Sets.
Foe smart collections, it's slightly easier: Create the smart collection using the criteria "Keywords>Contains>keywordname", which will automatically populate the collection with all the images that have that specific keyword.