You'll need lots, lots and LOTS of treats to make him to what you want
With that said, I recommend that you don't use a collar- I think you should use a harness. That way, if he does pull hard on the leash, he won't get hurt and it's more comfortable, for both cats and dogs (it's easier to get out of the collar too wheras you can probably get to him before he gets out of the harness if he tries).
But of course, you need to get him used to the harness
I did it this way with both of my cats:
First, put the harness on him. Wait until he lets you put it on him (as in: You don't want him to wriggle and such, of course he won't think it's funny anyway). He may be uncomfortable for a while, but let him walk around with it on for 5 minutes (unless he franticly tries to get it off of course- then, it has to be taken slow). Then take it off. Next time (next day if you have time), put it on for 10, then 15, etc. He should be pretty used to it after 10 minutes though
But stop when you've reached a couple of hours, you don't need to go up only 5 minutes each time if he seems to be comfortable. Mine got used to it after 2 minutes the second day, and I let her walk around with the harness on for 1 hour.
Once he's ok with the harness, the time has come to put the leash on. Put his harness on and let him walk around with it for a while. Then put on the leash and let him drag it around for a while. It's the same procedure as the harness, and he should be used to the leash pretty fast too. Of course you have to keep an eye on him so he doesn't get caught anywhere. You can try to pick up the leash and follow him around too after a while, just to let him know that the drag he might feel in the harness sometimes is only you.
Once he's used to both harness, leash and you holding the leash, I'd say you're ready to head out- he might want to take his time exploring, or he might want to just leap out and run around. He might want to hide under a bush or something too- either way, it's pretty normal, and you just kinda tag along
Of course, if it looks like he's going to hide under the bush for hours, you'll probably be better off taking him inside again and trying again later. However, none of my two cats have done this- they've been happy with it all and just leaped out to explore, with me attached to the leash
This is the kitten way- but I feel it's the best way as you're not stressing the kitty and he pretty much decides the pace
My cats didn't try to get outside without me either- they LOVED being outside, still do, but they knew they were only getting out if I was coming with them. I'm sure Turbo will accept this too.
I wish you good luck with your wonderful cats, whatever you decide