I too voted to send the youngster off to the trainer's. To bring a baby up to be a solid and reliable good citizen takes a lot of experience on top of pretty excellent riding ability. Those first rides can be key in setting the baby up for his using life, and if something goes wrong then you're well set for issues later. So, I would find a good, reputable trainer to do the starting, and look into taking some riding lessons on a horse that matches you and your skill level in the meantime. If your trainer will allow you to "visit" and see what he/she's doing, and even give a "lesson" to get you and your guy settled, so much the better. If in doubt, get help before things go south.
A stubborn horse walks behind you, an impatient one in front of you, but a noble companion walks beside you ~ Unknown