In Luana helps me, Luana does the helping and me receives it. Words like me, you, him and us are object pronouns, and in Spanish they normally go before the conjugated verb:

Subject	Object	Example
yo	me	Luana me ayuda. — Luana helps me.
tú	te	Yo te ayudo. — I'll help you.
él	lo	¿Marcos? Lo conozco. — Marcos? I know him.
ella	la	La invito a cenar. — I'm inviting her to dinner.
nosotros	nos	Marcos nos invita. — Marcos is inviting us.
vosotros	os	Os espero aquí. — I'll wait for you two here.
ellos / ellas	los / las	Las conozco. — I know them.

Lo and la stand for things too: ¿El libro? Lo tengo yo. — The book? I've got it.

Verbs to use them with: ayudar (to help), invitar (to invite), llamar (to call), esperar (to wait for), escuchar (to listen to), llevar (to take), entender (to understand — entiendo, with e → ie like querer) and querer itself, which with a person means to love: Te quiero.

With two verbs, the pronoun goes before the first one or on the end of the infinitive — both are right: ¿Me puedes ayudar? = ¿Puedes ayudarme? — Can you help me?