A wingclip will definitly help. IMO avairy birds should really stay that way unless you are extremely patient and experienced in taming and so******ing birds. This can take months, not days... not to say it cant happen, but it willl take a great deal of patience. But youve got him now and its onwards and upwards from here - it just might prove to be a lengthly process.
You willl see a lot of polarised debate on the 'morality' of wing clippinng, and ultimately it comes down to personal choice and what is best for the particular bird. I know our friend Oled above is vehemently opposed to the idea, which is an equally valid position to take. For me, I see no harm, in fact I would encourage it especially with an unso******ed bird. As you can see in the avatar, my Eclectus is extremely tame (lying on his back is a dead giveaway!). He was clipped once and is growing back in - and I will continue to clip lightly for safety reasons. You will see just recently another thread where a bird flew into a fan and died - and I have had a CAG who broke her neck flying into a wall when startled and a couple of escapees. If I had clipped these birds, they would still be here today, but that is just my experience. If i were to give you any advice it is start light so they can still fly a little bit to break their fall - accidents happen with clipped birds too.
'Morality' aside, IMO 99% of the time it greatly speed up the taming process. If you like you can start with a light clip - and remember they always grow back! But remember its totally up to you. Good luck with him and remember: patience, patience, patience!
