It makes me refreshed to start a day, and also gives me time to think about twhat I will do that day. It makes me refreshed to start a day, and also gives me time to think about what I will do that day.

It makes me feel refreshed to start a (the) day, and also gives me time to think about that I will do that day. It makes me feel refreshed to start a (the) day, and also gives me time to think about that I will do that day.

"start a day" is not incorrect, but the more common expression in English would be "to start the day"

It makes me feel refresh toed before the start aof the day, and also gives me time to think about twhat I will do that day. It makes me feel refreshed before the start of the day and gives me time to think about what I will do that day.

I think using phrases to describe your actions/plans instead of just putting adjectives together makes it sound more natural:)

It makehelps me feel refresh to start aed when starting the day, and also gives me time to think about that I will do that day. It helps me feel refreshed when starting the day, and also gives me time to think about that I will do that day.

What is the first thing you do in the mornining? What is the first thing you do in the mornining?

I always take a shower first thing after I wake up. I always take a shower first thing after I wake up.

Or "first thing after waking up"

OPTION A: I always take a shower first thingafter waking up. OPTION A: I always take a shower right after I wakeing up. OPTION A: I always take a shower first after waking up. OPTION A: I always take a shower right after waking up.