It's attitude, not qualifications
First let me just say that if you are looking at getting into the Helpdesk as an entry level support provider, YOU DO NOT NEED ANY QUALIFICATIONS.
They are looking for a warm body who is semi-literate....because you'll have a script you'll read from, certain trouble-shooting steps that MUST be followed (even when the customer tells you they've already rebooted, did a System Restore, updated their drivers etc etc).and essentially you'll be taking (usually incomplete) notes for the people who will call the customer back and actually try to help them.
Helpdesk is a good first step, but get the hell out of it as quickly as you can.
How, you ask?
By showing that you have CUSTOMER SERVICE SKILLS.
These are woefully lacking in many IT techs...who are generally socially inept, have poor hygiene, and talk to you like you're a mushroom (in the dark and covered in shit).
You need an active interest in the technology involved.
You need to be enthusiastic and engaged.
You need to be a consummate listener.
You need to want to help people with their problems.
You need to follow up with problems and close the issue WHEN IT IS FIXED.
Because as I always tell my staff, we are in the business of helping PEOPLE.
We provide the tools they use, and the environment they work within, but without the PEOPLE it all means exactly zero. So even if you are installing additional RAM in a server, rebuilding a RAID array, or establishing new backup procedures, you are, in the end, doing it to support the PEOPLE who are actually making the company money.
The knowledge of IT, the ability to work with the equipment and software, of how things work together and how to MAKE them work together, that's down to the environment of the company you are working for, and inevitably it's on-the-job learning.
Get yourself the best attitude before you start looking at qualifications.
Get in at the ground level somewhere and find out what they need.
Then begin to read.
Then make yourself your own test environment (so you don't fuck up theirs).
Learn it yourself, learn it well, then wait for someone to screw up, step in, fix it, and get noticed.