Where shall I get the syllabus for class tenth science (CBSE), and from which chapter do we generally start teaching? Should we provide the notes too? How shall I start the first class?

1. You can get it from CBSE official site: https://www.cbse.gov.in.
2. Start from challenging chapters like trigonometry, SAV, triangle, light etc., so that you get enough time for revision.
3. You can book a demo and check how the classes are conducted.

You may Visit the NCERT site to get PDF files of all textbooks all subjects. For additional questions, you also visit the Exemplar site, from where you can get worksheets and higher-order questions for Maths and Science.  You can get plenty of resource materials from the CBSE website itself. Other than that, there are plenty of other third-party websites like Cbseadda, Cbseonline, Jsuniltutorial etc., that provides excellent content free of cost. 

Hi Sona,
It is effortless to get the syllabus. Just go to the official website and download it; remember one thing you must download the updated one. And you can start teaching from the very first chapter, and if you are new, you can begin to whichever branch you know better. You must provide the notes and many examples other than the textbook so the student can get more and more questions. Start the class with brief information about science and explain what he will learn in 10th standard, so the student gets familiar with it.
I hope it will help you.

Hello 

You can get all curriculum-related details from the official website of CBSE. If you copy and paste the link I attached below, you can download the new CBSE Secondary and Senior secondary curriculum for 2021-2022 from the Official Website Itself.
http://cbseacademic.nic.in/curriculum_2022.ht

You can better start with 1st chapter on Chemistry/Physics/Biology,  as every consecutive chapter is advanced to the latter. 

Suppose you can provide your students with short notes/questionaries/presentation files/videos related to the topics /Question Bank after completing each chapter or in between. In that case, it will help the students to understand the concept in more detail. I usually do that.

I wish you a stroke of excellent luck in your future endeavours. I hope you find this helpful.