We are trying to plan a way to get into the little storage room in our basement.
We are trying to figure out how to get into the storage space in our basement.
ーWe are trying to plan a way to get into the little storage room in our basement.
「私たちは地下の小さな物置部屋に入る方法の計画を立てている」
are trying to plan で「計画を立てている・もくろんでいる」
a way to get into the little storage room で「小さな物置部屋に入る方法」
basement で「地下室」
ーWe are trying to figure out how to get into the storage space in our basement.
「私たちは地下の物置スペースにどうやったら入れるか考えている」
are trying to figure out で「考え出そうとする・解明しようとする」
how to get into the storage space で「物置スペースにどうやって入るか」
ご参考まで！
カナダ 
