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Wait until it shows signs of vigorous new growth and not just a few new leaves. There should be a significant root system, that is, roots are visible when sliding the plant out of its container. Conditions outdoors are very stressful to a plant that has been treated with TLC indoors. Don't forget to harden it off for 1-2 weeks, especially if it is going into full sun.

Curled leaves are an indication of a pest issue.

This article will help you.
https://www.gardeningknowhow.com/ornamental/shrubs/viburnum/pests-affecting-viburnums.htm

You are ambitious! It is not necessary to dead-head Viburnum. If you are lucky, the flowers were pollinated and will be followed by berries which the birds relish.

Prune after bloom. The plant has now finished blooming, but it has not set buds for next year yet. If you prune immediately after the blooms turn brown or start to set seed, your plant will have time to grow new branches and set buds for next year's flowers. Pruning immediately after bloom time means your plant will be able to produce blooms next year.
You could also trim from deep inside the plant by cutting close to the trunk and removing whole large branches. This technique opens up the interior for air and light and can reduce overall size. Your objective is to reduce the size by cutting branches shorter but also leaving branches of various lengths.
Soil should be loamy and well draining.

Viburnum leaf beetles are attacking your Viburnum. Both the larvae and the adults feed on the leaves. Here is detailed information that you can use to decide whether to remove your plant. It will recover this year - give it some fertilizer - but repeated years of defoliation will kill the shrub. http://www.hort.cornell.edu/vlb/

The shrub stays healthy in full sun to part shade, but sunlight influences blooms. Increased sun promotes more flowers and intensifies red and yellow fall foliage. For best blooming, provide snowball with at least six hours of direct, full sun each day.
Improper fertilizers can deter blooming. Avoid high-nitrogen fertilizers in particular. Nitrogen feeds vegetative growth at the expense of blooms.
Improper pruning can leave snowball bush bloomless. The shrub doesn't require substantial pruning. If pruned back heavily, it may need several seasons before it blooms again. If you choose to prune, do it immediately after flowering.
Stressful conditions can put snowball's flowers on hold. If soil moisture levels are off, blooming may cease. Snowball bush prefers consistently moist soils with excellent drainage. If lacking water or receiving too much, a stressed snowball bush may stop flowering.
https://www.gardeningknowhow.com/ornamental/shrubs/viburnum/viburnum-shrub.htm