It's your choice. This is a very compact variety of panicle hydrangea with strong stems produced at an early age. If they never exceed the size you prefer, you may never have to prune them. But as they flower on the current season's growth, you might want to take them back a bit. This will result in a denser shrub with more flowering points. But this is something that is done in late winter or very early spring. Leaving it as late as the beginning of May could put this season's flowers at risk - or at least the quantity.

Not really unless there is an aesthetic reason to do so. During the first few years, there is usually no reason but there are sometimes exceptions. Pruning is not required although you can prune leafless stems if they still remain leafless by the end of May in the south/June in the north. If you do prune, consider cutting no more than about 1/3 to minimize flopping although flopping mostly applies to taller specimens with much larger blooms than Bobo. Feel free to deadhead any hydrangea bloom at any time that you wish by pruning above the first pair of leaves or if the stem is leafless, cut the string that attaches each bloom to the stem.