Is there a template that allows me to create slides with only some simple formulas at most?
Assuming your LaTeX distribution has includes Beamer, here is a simple plain beamer presentation of a slide with an "equation".
Each slide is a
EDIT: a useful link provided by @textenthusiast:
You'll find quite a few samples installed as part of your distribution.
Have a look in
or if you want to view it online, http://www.ctan.org/tex-archive/macros/latex/contrib/beamer/