There are mainly three methods to find products on Alibaba.com:
1) Search with keywords;
2) Search with images;
3) Post RFQ;
Method 1: Search with keywords.
Go to Alibaba.com, enter keywords to search for the products/suppliers you want.
On the results page, you can narrow your search by clicking ‘Filter Results By‘ option, such as supplier types, Min Order, Price, etc. 
Search for Verified Suppliers（supplier’s company profile, production capabilities, products and process controls have to be inspected by independent third party institutions to assure reputable and consistent expertise on Alibaba.com.） by visit： https://activity.alibaba.com/page/verifiedsuppliers.html
Method 2: Search with images;
Go to Alibaba.com, click the camera icon, then click “Upload Image” as below to search for the products you want with existing product images. 
Note: Image size is maximum 5MB.
Method 3: Post RFQ.
Post an RFQ specifying your sourcing needs, and you may receive matching quotes from different suppliers. With RFQ, you can:
1. Get quotes for your custom request
2. Let the right suppliers find you
3. Close deals with one click
In addition, if you have found suppliers in China and want to learn more information and background about the suppliers, you could get supplier reports here. You may search the relevant supplier by their names and get the verified data you need to make better business decisions.
Note:
You can use Trade Assurance for extra order protection.