Congrats on taking that step forward!!
Its a tough question to advise someone on, as always its best to consult an accountant. I'm a bit confused by your question, as i'm not clear if you want to claim this expense on your personal taxes now or business taxes down the road. Regardless of that, I think an accountant can let you know how you can move forward now while not negatively impacting your tax situation. For example, my understanding is that since your biz doesn't exist yet it isn't very relevant now. You can purchase equipment personally, then when the business is established what you contribute to the start up (i.e. equipment previously purchased) is factored in to the startup based on your contributions to it. You can't claim on your personal and business both though - one or the other.