"Throughout the month of Elul, it is customary to blow the shofar one time at the end of the shaharit prayer of every weekday. This is done to arouse people into a heightened awareness of the need to repent before the ten Days of Awe. But there is one exception On the last day of the month, Rosh Hashanah eve, the horn is not blown. This is to distinguish between the voluntary blowing of Elul and the obligatory blowing of Rosh Hashanah. It is believed that this will confuse Satan and prevent his condemnation."

Excerpt from http://members.toast.net/rjspina/shofar.html

Video How to Blow Shofar: http://www.youtube.com/watch?v=GyHNKqmr-R8

Another link providing info. on the use of the Shofar, Ram's Horn (Trumpet):
http://www.youtube.com/watch?v=inu9CIFy-GM

If you can't make it to a messianic congregation or church that celebrates the Feast of Yom Teruah (Rosh Hashanah), then you can listen to this following example of the blowing of the Shofar:

http://www.youtube.com/watch?v=0jR20-0sy1Y

If you want to learn how to "play" the shofar, this video is very helpful... http://www.youtube.com/watch?v=xW1FQhNZE8o&feature=related

A few scriptures as examples of the importance of this instrument of God

Joshua 6:5
And it shall come to pass, that when they make a long blast with the ram's horn, and when ye hear the sound of the trumpet, all the people shall shout with a great shout; and the wall of the city shall fall down flat, and the people shall ascend up every man straight before him.

1 Thessalonians 4:16-17
For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:
Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.

Thank you so much. Do you have any suggestions about books to read on this subject or bible studies?

Breaking the Code of the Feasts may have been the first book I read on the subject and served as a good foundation for further understanding, one place where you can obtain it is thru Amazon books, link is http://www.amazon.com/Breaking-Code-Feasts-Perry-Stone/dp/0978592042

Barnes & Noble does not have it among author Perry Stone's publications, you can also check to see if he has it available for sale on his ministries homepage Voice of Evangelism.

There is also a bible study by Mark Blitz on his ministries homepage which is very detailed, www.elshaddaiministries.us where he explains all of the Feasts of the Lord.

Blessings!

Blessings to all as you approach the appointed Feast of the Lord... Yom Teruah.

Blessings.

Here is a very interesting description of what took place while trumpets were being sounded, has some elements of what is found in 1 Thessalonians 4:16-17, as quoted previously:

"It came even to pass, as the trumpeters and singers were as one, to make one sound to be heard in praising and thanking the Lord; and when they lifted up their voice with the trumpets and cymbals and instruments of musick, and praised the Lord, saying, For he is good; for his mercy endureth for ever: that then the house was filled with a cloud, even the house of the Lord;" 2 Chronicles 5:13

Have a very blessed Feast of the Lord, Yom Teruah {also Rosh Hashana}.

"The shofar can be made of the horn of a ram, antelope, gazelle, goat, or Rocky Mountain goat. These horns are not solid bone, but contain cartilage, which can be removed. The word shofar means “hollow.” The above animals are kosher, since they have spilt hooves and chew their cud.”

Excerpt from the following link,
http://www.myjewishlearning.com/article/how-to-make-a-shofar/