Issues to consider: Practicality- is the centre within commutable distance? -having a group to practice with is really helpful
will i benefit from this? (by this I mean moral, spiritual development- becoming a better person, reducing your suffering)
Do I get on with the teacher? -if you dont have some faith in his/her teachings it is going to be difficult to follow and practice accordingly.
Is it too different from my own beliefs- it is good to be challenged a bit but too much might just put you off- trying to swallow what you cannot..
Is the teacher (atleast) ethical, virtuous, kind/wise. Are the students (generally) look to you like they have benefited.
Remember you don't need to commit to one teacher- in fact, it is probably better if you don't. (when we think of religion often we think of committing- but is this really necessary?) Remember that this is your journey- you need to draw nourishment from where ever you can- and those needs will change from time to time- so as some teachers are better at somethings than others, you will need to draw upon different teachers and teachings at different times. Clinging to one teacher and getting railroaded into one way of thinking is not helpful- stay open. Your mind and needs are too complex to be satisfied with one teacher, in this journey to enlightenment.
Having said that, it is good to stay with a group of spiritual friends who will be your companions over many years- this helps motivate. You can take on their main practice while exploring other teachers/teachings- nothing wrong in that.
Hope that helps