Initial nursing care of an acute asthma attack

Hi all, i require a little assistance with the initial assessment of a patient with acute asthma

I am just a little confused with the nursing care i need to put it in order of clinical priority.

I realize i need to follow the ABCDEFG algorithm. Just i am not sure exactly what exactly should i administer oxygen therapy. Do i administer oxygen as soon as i have assessed his airway? and when do i start to give pharmacology medications such as nebulizing the patient? all help would be appreciated


thank you in advance