Hi Aklinda,
I would keep newly planted roses out of the sun for at least one week and after 1 or 2 hrs a day. After 2 weeks I give mine 1/2 a day of sun and gradually more.

You used huge containers. If a mini comes in small 4 inch pots or so mine go into one gall. pots first and a few month later when the roots are all the way down into 2 gall. This way the root system develops much faster. In the second season you could use the large container. Of course I am in Canada and your growing season is much longer, so just leave them in the big containers. I suggest that the next time you try it out and start them in 2 gall. pots.
Good luck George Mander

Here is a link that might be useful: Roses of Excellence

Thanks for your input, George. I'll leave them in the sheltered area against the house and in two weeks start gradually moving them into the light. I know now to use a smaller pot next time (and I'm sure there will be a next time).