I finally got off the plane.
Finally is the correct spelling.An example sentence is "you have finally learnt how to spell the word".
I finally, finished my homework.
The word finally is already an adverb.An example sentence is: "we have finally reached our hotel".
Finally the concert was over; it was so boring!
By use of the word in a sentence.
She finally plied him away from the television.
I finally found it! Eureka!!
finally i reached the place. I broke up with him Finally.
She finally decided to suppress the fight.
I finally found the solution to my problem
After a long time of walking I finally reached Midwest
After much determination, she finally solved the problem.