oracle – creating tablespacesteps – Database Administrators Stack Exchange

inorder for me to create space in the db
is this all i need to be doing

alter tablespace USER_DATA_TBS add datafile '/oradata/bosv/user_data04.dbf' size 10m; 

or are there other steps i need to take ?
i did look at this guide

i would appreciate if you could point me to the correct direction

this is what i have after i created a datafile
enter image description here