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1) Can ISO 27001 be implemented by a person who is not an expert on the subject of IT system, (I will be the only one and I am Chemist) but who has previously implemented ISO 22000.

First is important to note that IT controls are only part of the implementation of ISO 27001 (the number of non-related IT controls are greater).
 
Considering that, your experience in ISO 22000 will help (these standards share many common requirements, like document control, internal audit, management review, etc.), with the proper support.
 
Our ISO 27001 Documentation toolkit is made for beginners, with little to no knowledge of ISO 27001 (many companies with no experience in ISO 27001 have successfully implemented this standard with our toolkit).
 
To see how the toolkit looks like, please access this link: https://advisera.com/27001academy/iso-27001-documentation-toolkit/

For more information, see:

• What is ISO 27001 https://advisera.com/27001academy/what-is-iso-27001/
• Where to start from with ISO 27001 https://advisera.com/27001academy/knowledgebase/iso-27001-where-to-start-most-important-materials/

These materials will also help you regarding ISO 27001:

• Book Secure & Simple: A Small-Business Guide to Implementing ISO 27001 On Your Own https://advisera.com/books/secure-and-simple-a-small-business-guide-to-implementing-iso-27001-on-your-own/
• 27001 Free online training ISO 27001 Foundations Course https://advisera.com/training/iso-27001-foundations-course/

2) According to the fact that I am not an expert in information technology, which package is recommended to buy: 797, 1200 or 2000?

Considering your previous experience with ISO 22000, the toolkit with extended support (our second level toolkit) is a suitable solution, considering the 5 hours of one-on-one support with an ISO 27001 expert (against 1 hour from the toolkit with expert support), the expert review of 5 completed documents (against 1 document review from the toolkit with expert support), and the pre-audit check. In case you identify later that you need more support, you can ask for an upgrade in your toolkit.