Brendan here from the Shopify Support team.
I'm not sure if you've had a chance to check out the dropshipping option Oberlo yet, but Oberlo allows you to find suppliers of products in a lot of different categories of computer equipment including most of what you had listed. The nature of shipping items from Asia may restrict some larger items like chairs and desks, but I trust you'll be able to find most of what you're looking for with Oberlo.
Oberlo can be used in conjunction with other dropshipping providers to either provide the bulk of your inventory, or supplement items that you ship yourself.
You can find Oberlo and other great product sourcing apps through the Shopify App Store here.
If you have any other questions please don't hesitate to ask here or start a conversation with a Shopify Guru. We're available 24/7 at https://help.shopify.com/questions.
All the best,
I am an agent from China and I think I can help you to do drop shipping.
Do you have a Shopify shop now?
Please contact me to talk more,I believe I won't let you down.