One solution is to format the heading with the style and follow it with a hidden paragraph mark. You should format the text in the next paragraph with a style that is not included in the Table of Contents. A hidden paragraph mark keeps the text together on one line when it is printed, even though it is actually two separate paragraphs. The Table of Contents command picks up only those paragraphs with heading styles and places them into the Table of Contents.
Changing the numbering display affects how pages are indicated in the InDesign document, as in the Pages panel and in the page box at the bottom of a document window. The numbering display also affects how you specify page ranges when printing and exporting the document. However, the numbering display does not change the appearance of page numbers on document pages.
As far as I know, you can’t have auto captioning that changes from one heading level to another. Once you choose a heading level in the numbering options (e.g. heading 2), ALL captions of that type automatically change to that level (e.g. Figure 1.1-1, Figure 6.2-1). If you later choose a different heading level (e.g. 3), every caption now changes to that type (e.g. Figure 1.1.1-1; Figure 6.2.3-1). You can’t mix them up.

A quick search at the top using the term “document numbering” shows 46 different threads, with very good advice, for the most part.  I would first recommend you perform the same search and see what advice may be gleaned from those far older and wiser than myself.  In order to directly answer your question, I would refer you to the following discussion thread.  Many talk about the physical numbering system to use, which is important, and many discuss the frustration that a new person to the position feels when they inherit a mess from someone else and wish to clean it up. 
Determine what kind of numbering you want to use for your document or book. For long documents, you can assign chapter numbers. Each document can be assigned only one chapter number. If you want to use different numbering within a document, you can define ranges of pages as sections; these sections can be numbered differently. For example, the first ten pages of a document (the front matter) might use Roman numerals, and the rest of the document might use Arabic numerals.
To design a certificate from scratch, you can either start with a completely blank publication or adapt an existing publication. Small-sized publication types, such as business cards, postcards, and labels can be adapted to serve as coupons. Flyers or brochures can be adapted for use as gift certificates. For more information, see Create a publication in Publisher. sequential numbering in word
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