If you are just starting with origami it's best to start with the more
easier models.
You can search the internet for diagrams, because on almost every site
about origami
are diagrams for various models. And nowadays, people also place videos
of folding
models on the internet.
Almost every sort of paper can be used for origami, as long as it's not
to thick.
I like to print my own patterns on copy-paper.
Take your time to learn to fold a new model from a book or the
internet. If you don't
understand a diagram, just lay it apart for some time and try to fold
it later.
Below are a few videos of folding models which are nice to start
origami with.
Folding a Tulip
Folding a Flower
Folding a Bird
This is
also an easy model to fold. Click on the picture if you want to see
the diagrams for folding this heart.
This box is not very difficult to fold too. Click on
the picture to see diagrams of it.