Here's one article. Plantlady has pictures at her website too, I believe, that show the whole seedling shebang in action! I'm still so green with envy over those 60+ acres Plantlady. Unless you tell me I'm the one who has to weed them all- or dig all the dahlias!

I'll let Plantlady post a link to her seedling page if desired. It's worth it just to see those photos! Meanwhile, below is a link to an article...

Here is a link that might be useful: One way to collect seeds from dahlias

Here's our site. Look in the Seedlings album. The seed picking pictures are towards the back of the album.
If you want to hand pollinate AA dahlias you can give them a bit of a "haircut" - trim their petals to about a BB sized dahlia so the pollen gets where you need it. Be aware that even if you only use AA moms & dads for seed parents, you will still get a lot of smaller babies. We only have AA & A sized dahlias in our gardens but still get some smaller blooms. If you let the birds & bees do the pollinating & you have open centered or small dahlias around you will get a lot of open centered & small dahlias.

Here is a link that might be useful: Wynne's Seedling Album

I'm new to this seeds collecting and having a ball. Are there pictures of what the dahlia seeds look like?

There are pictures of seeds in our seedling album at the site in the above plantlady2 post.