There isn’t a set profit margin for anything I’m aware of in the retail side of IT.
Theres too many variables. Just as an example, if you are selling commits for Cloud Services, Microsoft for example, could have maximums. That means if you close a $100 million commit over 5 years don’t expect 5x more margin compared to a $20 million.
If you want to break into the tech sector I’d focus on professional services. You have more control over the cost, and can communicate the value to the customer easier with less friction compared to selling “Just another HPe” reseller.
Coming into this having considered this with a close friend many years ago, and the realities we saw that came up.
The very first thing you need to ask yourself is do you have a large enough nest egg to give you the runway to get a business up and running with some sort of reoccurring revenue? What is your way of monetizing? Do you have the skills needed on the development side, operations side, and business side to get you to where you need to be to make this successful.
My personal recommendation for you is to start going to various software/tech user groups in your area, especially entrepreneurial one focused on startups.