First, I suggest you to learn more about Solarus before launching you in a big project.
Christopho has made a big work and all is clearly explained in the
documentation and
video tutorials!
1. See the
menu API and the
menu:on_key_pressed() event for the continue button.
Maybe that if your game is never load you need to understand why?
When the engine have errors he puts them in the
error.txt file.
If there is no errors in this file, may be that's due to your script which do nothing or not what you expect.
2. See the
audio API.
3. See the
surface API and the
menu:on_draw() event.
4. See the
item API and the
enemy API.
For the sword, you need to define a new variant in the sword item and add all sprites related to this variant.
Then you can define the behavior of enemies when hurting by the sword (and check the variant to make what do you want there) with the
enemy:on_hurt_by_sword() event.
The best way is to use metatables for that but it is not easy for beginners, it allows to define an event for all objects of the a same type.
You can find an example in the
quest_manager.lua script of zsdx.
5. See the
NPC API and
movement API.
You can find examples of scripts in the official games:
so, there you have a
title menu script,
sword item etc ...
Finally, I advise you to take the time to learn and to progress step by step.
