Hey man listen i was the same a while back! so do you have any experience with coding? if not you should visit https://w3schools.com it has alot of tutorials on coding that will hopefully help you, and to edit the website and add files to it you can use https://filemanager.ai/ which is easily accessible by pressing the File manager button on your website dashboard just like in this screen shot
after you press the file manager button it will instantly redirect you and log you in once your in you just have to enter the htdocs folder and then all your website code should be there! also if you want you can google website templates then find ones that suit you then you can download them and import them into your website then edit them as you would please! hopefully i was able to help you!