You’ll be involved in most major technical decisions for your team. Involved, however, is not the same thing as being the person who makes all of them alone. If you start to make all of the technical decisions without soliciting the input of your team, they’ll resent you and blame you when things go wrong. On the other hand, if you make no technical decisions and leave everything up to the team, decisions that could have been made quickly can drag on without resolution.
Determine which decisions must be made by you, which decisions should be delegated to others with more expertise, and which decisions require the whole team to resolve. In all of these cases, make it clear what the matter under discussion is, and communicate the outcome.