the sentence which means what you want to do is ～たい。(~tai) Putting a verb in"~", you can mean what you want to do. For example, "I would like to go to restaurant" is, 私はレストランへ行きたいです。(watashi wa restoran e ikitaidesu). When putting a verb begore "～たい", you need to change the ending of a verb into い or え sounds, nomally. For example, the verb, ”する” (to do)　 needs to be changed into ”し"(shi) before ”～たい”. the verb, ”食べる"(to eat) needs to be changed into "食べ"(tabe)　before”～たい”. the verb, "寝る”(to sleep) needs to be changed into ”寝”(ne)　before"～たい". This difference of whther　い or え sounds depends on conjugation of each verbs. I'm sorry for not being able to answer this question well, but i would be happy if it becomes your help. bye.