On this site to start with, Silversixpence. Try using the 'search' box for each plant.

If that doesn't give you the information you need, then type the list here under my answer, and we'll try to help you.

As long as you have the full Latin names of the plants, you can google them individually and probably find the info that way, too, though it can be time consuming. Probably easier to post the names under here and we'll tell you, lol.

I have managed to find a few on this site but I would be very grateful for help with
the following:
Galliardia 'Arizona Sun'
Papavar 'Garden Gnome'
Campanula 'Blue Chip'
Geum 'Lady Strathden'
Delphinium 'Black Knight'
Iberis 'Snowflake'
Lobelia 'Queen Victoria'
Digitalis 'Camelot'

Many thanks.

Gaillardia - a short one, 8 - 10" high, plant 12" apart.
Papaver - compact, 12" x 12".
Campanula - same.
Geum - taller, up to 2' x 2'.
Dephinium - very tall, will need staking...to 4' or more x 2'6"
Iberis - short, to 8" x 15"
Lobelia - tall, to about 3' max x 2' if you're lucky - snails and slugs love it!
Digitalis - tall, to 3' x 2'6". Biennial.

Hope this helps. :-)

Dear Sprizhenry,
Thank you very much.
It is gratifying to know that people like you take the time and bother to help an ignorant stranger.
I have always grown a few vegetables but have become more interested in flowers since retiring recently.
Once again, many thanks.
Silversixpence.

You're very welcome, Silversixpence - it's great being retired, isn't it. You get to choose what to do! :-) I hope your new plants thrive.