I think I understand your question.
What you want to know is how to use "me" as part of the phrase
"Yo me". Considering that you are building a PowerPoint in which you introduce yourself, my guess is that your first slide would be "Yo me llamo" and other statements of the like.
In that case, "Yo me" is a Spanish reflective phrase which really means "I am .....(verb/doing something involving myself)".
Yo me llamo - I am called/named
Yo me voy- I am leaving
Yo me visto- I am getting dressed/ I get dressed.
This is the way that syntax works in Romance languages like Spanish, and it is completely separate from the way in which it is broken down syntactically in Germanic languages, such as English.
Now, in Spanish, "mi" (as opposed to "me") is a possessive which means the same as "my".
Therefore, do not worry about writing "mi" in any of those slides unless you are going to talk about possessions, family, or personal descriptions.
Mi hermana se llama... - My sister's name is...
Mi cabello es rubio.- My hair is blond.
Mi color favorito es azul.- My favorite color is blue.
I hope this helps, because I can only imagine the frustration trying to differentiate two words that sound so similar and seemingly alike in meaning-when they are not.
The Spanish word "me" ("e" pronounced as in English "bed") is a structural word which can be translated: 1) into the English word "me", e.g. "Me lo dió" "He/she gave it to me", 2) into the English word "myself", e.g. "Me corté" "I cut myself", or 3) into "nothing" e.g. "Yo me levanto temprano" "I get up early" - this is the case for what are called "reflexive" verbs, like levantarse, lavarse, peinarse, etc. where the particle "se" at the end of each verb changes into "me" for the first person singular: "yo me levanto" (I get up). "Yo me lavo" (I wash), "Yo me peino el cabello" ( I comb my hair).
The is no definite word for me, it is usually implicated.