Any evidence that you gather on your own will likely prove beneficial. However, your injuries may preclude you from feeling physically able to gather anything. If so, hire a legal team as fast as possible, so an attorney can visit the site where the accident occurred and collect all available evidence.
From there, your attorneys acquire anything available to prove your case. This includes taking photographs and interviewing witnesses. Plus, any video footage from security cameras can prove very valuable.
Sometimes, this process requires requesting a subpoena to obtain indoor video footage. For cameras in public locations, however, you will find it easier to gather video evidence.