Dylan ...
Roses are pretty forgiving. Also, there are a lot of "right" ways to grow roses ...
The information I am sharing is based upon what I have learned over the years and my own experience. Others may do things differently and the rose will still be OK.
I haven't used any of the potting soils currently on the market, many of which say they feed the plants for months. Maybe someone else who has experience with them can give you better advice than I can. The most important thing about your choice of potting soil is that it has good drainage. If it doesn't drain well, you can end up with root rot. If it drains too fast, you will have to water your rose more often.
If you are placing your container on hardscape, you will want to lift it a bit so that water can drain out when you water the container. You want your soil moist, not wet.
Your choice of container makes a difference, too. I don't like to use clay containers because they can wick moisture away from the root mass and can get quite hot. After all, people cook in clay. If you do use a clay container, line it with bubble wrap and this will insulate the root mass. I prefer to use plastic or thermolite containers.
Generally, roses need six hours of sunlight. Your rose probably has never had that much, so you need to harden it off by starting it out in dappled shade and moving it gradually to a sunnier site.
Roses do not need to be misted.
After transplanting wait to feed the rose until you see new top growth. This tells you that the root system is working and can handle being fed. My rule of thumb is to feed lightly and often. I used regular liquid plant food at half strength. Water your rose well the day before you feed it and you won't have any problems with fertilizer burning the roots. I think this is wise whether you choose to use organic or chemical fertilizers.
I understand your wanting to do everything right with your first rose. However, you can do everything right and a rose still might go toes up. It depends on the rose. Roses are tough and are good survivors, so I think you won't have that problem. It's just a possibility.
Feel free to keep asking questions. There are a lot of members here that are happy to offer you support.
Smiles,
Lyn
