tToday's a little rest day. Today's a little rest day.

Sentences always begin with a capital letter.

today's a little rest day today's a rest day

today's aA little rest today A little rest today

I assumed you meant possessive (の) here

I am just a little bit tired. today, I am a little bit tired today,

aAnd then, I will bhave rest. And then, I will have rest.

and then I will be taking a rest. I will be taking a rest.

and thenso I will bejust rest., so I will just rest,

aAnd then I will be rest. And then I will rest.

"I will [verb]" or "I will be [verb]ing"

soSo, I'm not going to write sentences. So, I'm not going to write sentences.

so I'm not going to write any more sentence. so I'm not going to write any more sentence.

soand I'm not going to write any sentences. and I'm not going to write any sentences.

sSo I'm not going to write any more sentences. So I'm not going to write any more sentences.