How to plan the startup Launch Event?

I am about to Launch my (eCommerce) website in 1 month. My mind is mingled with different idea's, wondering how successful startups do the Launch Event?. My startup is related to (buy and) and creating custom/personalized t-shirts online. Please advice on how should i plan it and the things that i need to consider, Also please do share your personal experience if you have been through this?