Simpliest way to add gallery from defined folder

I am trying to find a simple solution for a gallery. All I want is
1. FTP Upload a folder with images inside the folder.
2. Add tag to the post (even better a template tag), that consists of “folder name”.
3. Recieve a thumbnail gallery inside the post from the specified folder. Thumbs should be created automatically.

I am doing post uploads on my site. Every post could have a gallery within it. I dont want to wate time to – upload in web interface, check, click, ok, cancel – then go into Post Edit and add some strings to bring the gallery into the post body.
I want to “CSV Import posts”, add Custom Field – “Image Folder Name”.
Then, I want to add a tag into template that will do the next
If <customfield with gallery folder name> IS EMPTY- do nothing
ELSEIF <custom field> has something DO
If gallery folder found – show thumbnails (if thumbs not created – create them)
If gallery folder not found – do nothing”

So now, the only thing I need to do is to 1) upload via ftp 2) check that folder i uploaded is named in a custom field.