Hey Diana, fellow jock here . Originally from Edinburgh but living in sassanac land now.
Plenty of places in the UK sell bees on langstroth frames so don’t stress too much. I’ll dig up some that you can order from online and they post them to you.
Best advice is to source and join your local bee club and they should be able to help you with bees.
You can always get a package rather than a nuc and let the bees draw out natural comb you’ll just need to help them out feeding for a bit the help draw wax but duesnt take long.
Frederick Dunn’s YouTube channel and Flows have all the basics and then some plus there is thousands of others to learn from.
Use this forum as much as you can as it’s one of the friendliest and a wealth of experience and archived posts.
Best beginner advice I can give you is to invest in a second brood box or half brood as the winters in “sunny Perth” the stronger the hive numbers the better.
Trust me as a Scotsman forking out £700+ on a hive brought a tear to my glass eye but the joy its brought me, my family, neighbours is priceless.
Beekeeping isn’t hard. You just need to invest the time and ask ask ask for help when your not sure.