I think it's going to be fine - it's very early days yet and it'll spend most of it's first year developing a strong root system. I think you'll get some flowers too in a while - there are plenty of green buds left. It will eventually grow to more than a meter across, but that could take up to 10 years - this year it's still a baby.
It does enjoy the sunshine so when we get some it'll put on a bit of growth this year - possibly put a mulch of compost around it and, if you want to take extra care of it, if we get a forecast of very cold weather next winter I'd make a wigwam of sticks around it and make a tent of fleece just to make sure it doesn't get nipped back by icy conditions. But don't let it get all damp and fuggy inside the fleece or it'll not like that either. But don't think that it's a complicated plant to grow - it's not and it'll cope with most things except very very cold weather.
I bought a cistus for my very elderly parents some years ago and planted it where they could see it from the house, within a couple of years it gave them much joy for long weeks every summer