Céeci est maon première écriturer texte ici

"une écriture" is a writing system or a way to write
Something's written has various names depending on the situation, but "texte" is the most general one

Je ne sais pas quoi à dire.

Puis-je direraconter une histoire ?

raconter = to tell (a story), to narrate
dire = say (it's used with much shorter definite things, like "dire un mot")

J'ai demandé un femme pouronné un rendez-vous amoureux à une datfemme.

to ask someone out for a date = donner un rendez-vous amoureux/galant à quelqu'un ; proposer à quelqu'un de sortir
"date" in this sense is an anglicism; "une date" is a day in the year, normally

J'arrive là, seulement trouvery vais, et là

The "only to find" structure would work in English, but not in French. I've suggested an alternative
You went there so from you're point of view, so you'd need "aller"; "venir" would be from the woman's perspective, so "venir" would be correct

elle esétait venue/là avec son petit ami! !

"venir" happened before the perspective of "aller", which is itself in the past = "past in the past", pluperfect => elle ÉTAIT venue
With "être" as an auxiliary verb, the past participle agrees with the subject => venuE

Elle a croir que c'ét[voulait une siturelation/un amour platonique. ?]

We say "un AMOUR platonique" in French, a sexless, non-physical love. However, it doesn't imply dating someone when you already have a boyfriend, it just means you're not carnal with the person you're committed with, so I'm not sure I've grasped this one

If she just wanted you two to be friends, "elle ne voulait qu'une relation amicale" would be the correct term

Est-ce une histoire compréhensible ?

Space before and after : ; ? ! « » %