Leaving Home to become a sramana a left home man given 10 precepts or sramaneri also referred to as sramanerika a left home woman given 10 precepts in the West has to be the hardest for those that have no idea where to start to find a place to leave home to. In Buddhist countries there is the advantage of knowing where to go and the best places to go to.
It is important to go to the places first that you wish to ordain with, for women this means a longer period of observation while attending the temple as a lay Buddhist and then joining in volunteering. Most training places in the USA are founded by overseas Buddhists thus their primary culture and language is not English. The two largest places for those intending full ordination while training in the USA are the Sagely City of 10,000 Buddhas in Northern California www.cttbUSA.org and the Hsi Lai Temple www.hsilai.org in Southern California.
Both places have a "look and see" type program for inquiring people who want to consider leaving home to become ordained. These programs are likely to ask you to be a volunteer for some time 3 to 6 months as you will better understand by experiencing monastery life.
Both places offer training with spoken English but will include and encourage you to study the Chinese language for benefit of understanding and participating in the Buddhist ceremonies which is also written in the Chinese language. Most of their material is in Chinese with instruction in Chinese but with English as well. It's great to learn both if your first language is neither then you need to know at least one of these two.
They both provide excellent educational opportunities.
If you choose a smaller temple it may be better to be sure you undertake it with a mature understanding. If you are the type to take on a new language and culture with a good deal of tolerance and enjoyment then go ahead. If you can't stand any type of new food or traditions then just forget it. In a smaller setting you will be taught most of the services during the course of the year, the music, the instruments, the care and preparation of services, food and events. Everyone is wearing all duty's hats, the decisions are made by the abbot or abbess generally, everyone is responsible for themselves, their health, their training. You need to be able to take the public nature of your life, the idea of being on a stage from the time you are up to the time you close your eyes and sleep is a good image to keep in mind. Most of the training places are based on the Dharmagupta Vinaya precepts meaning they are entirely Mahayana in orientation.
The best training is the one that is taken fully understanding what you are getting into, seeing problems clearly in others and in yourself and striving on in spite of them both for yourself making sure you are committed to the new role and walk the Path you undertake in purity and dedication.