from amazon to ebay

I would like to sell items from amazon to ebay but I don't know where to begin this plan.

If you will check my profile I am also seeking help on how to create a site which will be monetize via amazon.
I need extra cash to support my family. I have a son and my wife currently pregnant on our 2nd baby. Which is why I need some extra income for her delivery.

Going back to the topic. Hopefully there is someone here who can point me to the right direction on how to start this plan.
I know I have to search amazon items that is sold more cheaper than those being sold in ebay to gain a profit.
Is there a method that I need to follow?
Are there ways of searching items in amazon and ebay to make comparison easier.

Some will say use the search bar. I did that already but I never saw some light.
Hoping someone can point me where to go, I am willing to learn it.

Honestly, you aren't going to see the light and here's why...

Margins when going from Amazon to eBay (or eBay to Amazon would be my preferred method because Amazon seems to dick around with sellers less than eBay) are going to suck. eBay takes a cut I think about 10% these days, PayPal takes a cut around 3%, eBay buyers expect free shipping more often than not so you got to take that out, and you got the percentage of scammers. You're not likely to find that large of a margin gap (~20%) between Amazon and eBay.

You also will have a limit of 10 items or 1,000 dollars revenue on that eBay account unless you're already well established. This in itself makes it's near impossible to make a decent amount of income as a good sell-through rate might be 50% or $500 a month max revenue. Now take out eBay fees, PayPal fees, and the price of the item itself and you might be looking at a hundred bucks max profit a month.

Here's what I would do in your situation, I'd start selling assets. I'd sell my nice car and buy a shit box, I'd sell the nice furniture and replace it with thrift store furniture, etc. If that's not an option it's time to consider a second job.

as above just not worth it no real margin

Not to mention that you are going to have got through the awful Ebay/Paypal verification process which puts your money on hold for about 10 days on each of your first 30 or 40 transactions. So, 10 day delay will most likely get a negative review.

Your margins are going to be to low.

Concur with all above...both Amazon and Ebay are pains in the butt to deal wth...why try to involve both with extremely low margins?