Much
When we use 'much' or 'too much', the subject of our sentence should be singular, or a group or collection of things indicated by a collective noun (which you treat as a singular word). You should never say 'too much things', for example, because 'things' is a plural word. There are exceptions to this - as there are in many situations across the English language. A common exception is 'people' - you say 'too many people', not 'too much people'.
Examples
Just like 'many', you can put 'much' at the end of a sentence, as long as it's clear what you're talking about.
Examples