Thisoday is themy first day, when I begin writing here.

I don't know exactly, know what about I want to write about.

I'm going to share, what I did today.

I woke up at seven -thirty and got out theof bed at eight o'clock.

I did'n't sleep well, because my cats were noisy.

While I was drinking my coffee I was seeing a serietched a TV show in eEnglish with eEnglish subtitles.

After that, I did yoga for half an hour and then I also didworked out for fifteen minutes workout.

After all the exercises I've goting, I took a shower, I did my make-up, and went to one of my favorite pho bars.

At the end of myEating lunch, I warmed outme up.

Then I went to the Pplaza to buy two cups, a candle, and a candle sticker.

Then I started to write this and now I'mve finishinged my first post.

This is the first day, when I begin that I am writing here.

I don't know exactly, what about I want to write about.

I'm going to share, what I did today.

I woke up at seven thirty and got out theof bed at eight o'clock.

I did'n't sleep well, because my cats were noisy.

They wanted fine food, so I had to go and feed them.

I boiled water with my my kettle and made a coffee.

While I was drianking my coffee, I was seeing a serie itched an eEnglish show with eEnglish subtitles.

In this case, "show" sounds more natural than "series." "Series" has more of a feel of watching the whole entire thing from start to finish and not just a few parts or episodes.

After that, I did yoga for half an hour, and then I also did a fifteen -minutes workout.

BeI fore that ( I forgot it) I'vegot to mention it, but before that, I cleaned my apartmanent.

After doing all themy exercises, I've got took a shower, I did my make-up, and went to one of my favorite pho bars.

I had to wait, because there were manya lot of people.

I asked for a big pho soup with pounached eggs.

AtBy the end of my lunch, I warmed outs warm.

Then I went to the Plaza to buy two cups, a candle, and a candle sticker.

I came home, made and did some extramore exercise.

I had more calls withcalled some friends, while I was making my dinner, thatwhich was oatmeal with pear.

I started to write, and now I'm finishing my first post.

Thisoday is the first day, when I begin wri I will be posting here.

I don't know exactly, what about I want to write about.

I'm going to share, what I did today.

I woke up at seven thirty and got out theof bed at eight o'clock.

I did'n't sleep well, because my cats were noisy.

They wanted fine food, so I had to go and feed them.

I boiled water with my my kettle and made a coffee.

While I was drinking my coffee I was seewatching a series in english with english subtitles.

After that I did yoga for half an hour and then I also did a fifteen minutes workout.

Before that ( I forgot it) I'ved cleaned my apartmanent.

After all the exercises I've got had a shower, I did my make-up and went to one of my favorite pho bars.

I asked for a biglarge pho soup with pounached eggs.

AtBy the end of my lunch, I warmed outs warm.

Wasn't sure what you wanted to say here.

Then I went to the Plaza to buy two cups, a candle and a candle sticker.

I came home, made and did some extramore exercise.

I had more calls withcalled my friends, while I makingde my dinner, that was oatmeal with pears.

I then started to write and now I'mve finishinged my first post.

This is the first day, when I begin that I've started writing here.

Verb tense

I don't know exactly, what about I want to write about.

unnecessary comma, word order (Subject - Verb - Object) I - "want to write" - about

I'm going to share, what I did today.

I woke up at seven thirty and7:30 but got out theof bed at eight8 o'clock.

no need for "the", full verbal phrase is "get out of"

I changed it to "but" because "and" is implying those to things happened at the exact same time (or very short amount of time). However, you stated two separate times 30 minutes apart.

You could also say "I woke up at 7:30 and got out of bed" without 8 o'clock, but this is implying that you got out of bed immediately after waking up.

Changed it to 7:30 and 8 because we typically don't write out times, just use numbers.

For emphasis, you could right 7:30am but most people will assume you mean am when you are waking up and not 7:30pm.

I did'n't sleep well, because my cats were noisy.

apostrophe in wrong spot, unneeded comma

They wanted fine food, so I had to go and feed them.

no need for fine or the "and" between your two verbs. "had to go feed" is one verbal phrase

I boiled water with my my kettle and made a coffee.

accidentally put my twice; no need to have an article before "coffee" it is a collective noun

While I was drinking my coffee, I was seewatching a series in english with english subtitles.

After that, I did yoga for half an hour and then I also did a fifteen minutes workout.

After all the exercises, I've got took a shower, I did my make-up, and went to one of my favorite pho bars.

I had to wait, because there were so many people.

added so for dramatic emphasis

I asked for a big pho soup with pounached eggs.

i think you mean poach... like the style of egg with runny yolk?

Then I went to the Plaza to buy two cups, a candle, and a candle sticker.

I think you may mean "candlestick" like to put your candle on? not a sticker shaped like a candle?

I came home, made some extra exercis and exercised some more.