This is strictly up to the groom. There is usually a Best Man and typically two to three groomsmen but this is just a usual number it can be as many or as little as you like.
They're bridesmaids and groomsmen.
The amount of groomsmen for a wedding largely depends on the size of the wedding. For small weddings only a best man, who is the chief assistant to the groom at the wedding, may be needed. For larger weddings up to 10 or more groomsmen may be chosen.
Scotland.
A good gift for your groomsmen is a personalized shot glass. Personalize the shot glasses with the name of the groomsman and a little logo of your wedding.
The cast of How Not to Plan Your Wedding - 2010 includes: Janine Arce as Bridesmaids Barbara Kendrick as Bridesmaids Aaron Leupp Graham Leupp as Groomsmen Kristen Rossow as Marsha Eleazar Villegas as Groomsmen
A wedding entourage usually involves the members of the bridal party. This includes the bridesmaids, maid of honour, groomsmen, best man, flower girl and ring boy. The size is dependent on how many people you would like.
I think the best gift to give the groomsmen at a wedding would be something unique and individualized. Such as something with the gentleman's name on it. Maybe something that has to do with what the individual you are gifting is interested in. Such as a zippo with their name on it for a smoker, or a personalized pen set for a businessman. http://www.groomstop.com/
The Best Man can arrange for just cars to transfer the groom and ushers to the wedding or they can hire a limo service. When the groom leaves the church after the wedding he goes in the limo that his new bride is in.
Basically, the groomsmen are the "assistant best men". They are up at the front with the wedding party, and have a corresponding bridesmaid partner. Ushers "work the aisles" in the church - they seat the people in the main body of the church. They do not have a corresponding female partner, at least as their function as ushers goes.
There are many positions that are involved in the wedding besides the bride and the groom. There are many variations depending on the religion of the couple. The most common positions despite religion are the best man, the maid of honor, the groomsmen, the bridesmaids, the ushers, the flower girl, and the ring bearer.
It's optional, and so are the groomsmen. Usually, they have flower girls, but can also have boys as ringbearers.
* It is traditional that the groom choose his Best Man which is a good friend or even perhaps one of his own brothers. It is fine if you choose to have your two brothers as ushers and this way they will be in many of the wedding pictures. Be sure to have a picture taken of just you and your brothers together and then you, your new husband and your brothers, etc.