it's understandable but if you like to learn how it's written, here it is:
minä haluan oppi suome keili
minä haluan oppia suomen kieltä or then you can only say "oppia suomea"
you conjugate only the first verb, all the following are in infinitive
and "suomen kieli" or "suomi" means Finnish as a language, so you can use which one you like, but in that sentence it must be in partitive "kieltä" instead of "kieli" or then "suomea" instead of "suomi"
hope that helps :D
