То and это have very similar paradigms. They both change according to the gender, the number and the case of a noun they modify.
The only difference is the endings that start with an И: тот features stressed endings that have Е instead: э́ти↔те, э́тим↔тем, э́тих↔тех, э́тими↔те́ми
In sentences that start with "This is" only это ("this") is commonly used, not то ("that"). In poetry, however, то can be used as well; it lets you get rid of an extra syllable and keeps the meaning more or less intact.