Training is so fun! If you haven't done anything yet at all I would start with target training. That one is a really easy one to teach and all you need is a wooden chopstick to use as a target pointer. This video teaches you how to train target and spin:
Really for target training you just hold the chopstick in front of them and as soon as they touch it say "Good bird!" and give them a training treat. Find a treat he loves and only give it during training sessions. For Ona that is safflower seed. Be consistent with the reward.
Try starting there and then work your way to fetch next! It's so much fun. I could talk about training all day. Feel free to PM me if you want more advice about any of the above.
Check out Ona's training video to see a lot of her tricks:
@wrench13 inspired me with his fantastic video of Salty showing off all his tricks and I decided to make one for Ona! Check it out on her thread here: https://www.parrotforums.com/threads/onas-thread.95301/page-14#post-1054009
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