Answer your questions one by one:

1. First of all, as far as the example you cited is concerned, it is literally unnecessary to register an abbreviation. Because at the time of examination, whether the meaning of a trademark is the same is a standard to judge whether it constitutes approximation, so there is no need for two trademarks with the same meaning to be registered repeatedly. As for whether or not to register Pinyin, you can add it or not according to your own wishes, and it is recommended to add it. (Another thing to be reminded is that the example you cited: electronic toys can't be registered in 28 categories-toys, which belong to the common name of goods and have no significance);

2. If someone else has already registered Pinyin, your re-registration of Chinese characters will be rejected by the Trademark Office. It is recommended not to register.

3. Before applying for a trademark (that is, before it is approved by the Trademark Office), the applicant has no exclusive right to use the trademark, and can't prevent others from using it during the application period. However, the trademark protection is the application first, so you have applied, and others can't register. The application submitted after your application will be rejected by the Trademark Office;

4. Company name registration and trademark registration are two different things, which are regulated and managed by different laws. The approval of company name is managed and examined by local industrial and commercial authorities, which is regional, and different administrative regions can register the same company name; Trademark registration is managed and approved by the State Trademark Office, which is national and protected nationwide.

5. This is the same as the above question. The company name and trademark are under the jurisdiction of different departments. If your trademark is not a well-known trademark, you can't ask others to change the trade name or company name.

if you have anything unclear, you can contact me. I can further answer for you!

Supplement:

Let me correct it: If you have the same pinyin first (only pinyin, without Chinese characters), you can still register Chinese characters with the same pronunciation; If there are Chinese characters with the same pronunciation first (only Chinese characters, without pinyin), you can also register pinyin with the same pronunciation. If you have both Chinese characters and Pinyin first, then you can't register the same simple Pinyin or simple Chinese characters.