If the question is about how to reflect the various “add-ons” (pictures, drawings, schematics, …) in the TOC or some “Table of Figures”, “Table of Schematics”, …, the first thing to do is to attach some “meta-data” to them.
The simplest way to do it is to select the “object” and Insert>Caption. Anyway, I guess you already have some form of caption, at least to designate the object in the text, but these manual captions are not known to Writer because they are not marked as such.
The dialog allows you to select in which list you want to register the object. Figure, Text, Drawing, … are built-in choices. You can create your own but begin by using the provided categories.
The caption is referenceable and its properties can be Insert>Cross-reference, Cross-references tab when you need the object number, its page number or even the full caption in the text, thus avoiding the tedious update job when you insert a new object which changes numbering.
The same way you create a TOC, you Insert>OC & Index>TOC, Index or Bibliography to build a Table of Figures (generic name for all tables of …) by selecting the desired Category (Figure, Drawing, Illustration, …).
For other aspects in your question, please describe exactly your difficulties.
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