Images, galeries, attachments

Hello, help me please with module selections. I need this combination of functions:

1. File attachments (Drupal core module and File Upload Path, this is clear)
2. Easy inserting of attached images or files to the content via special tag - I need auto resizing of images. Inline module is the right choice?
3. Automatic creating of galleries based on attached images.

Thanks for any ideas or working examples using it.