Acquisition of tools

I am a private contractor who is starting from scratch. Do you know what I’d like? I’d like to have a list of must-have instruments and materials for those music therapists working with children. (And I’d also like to have the budget to acquire those things right now.) I am trying to accumulate a cache of tools as I am able, and I also find many, many ideas from other bloggers, but I still feel under-armed, if you will. I am trying to realize that this kind of business-building process will take its time.