If you are considering a short-term missions trip, here are three articles a recently wrote on the topic over at The Gospel Coalition to help you prepare and think through some issues you might not be aware of.
There are a number of helpful resources I would commend to you for further study.
A Guide for Prayer
Books on Culture Learning and Interaction
Books on Follow-Up
Books on Organizing and Leading
Books on Money and Partnerships
Books on Support-Raising
Specific to Theological Education
Darren Carlson is the Founder and President of Training Leaders International. As President, Darren oversees the general direction of the ministry and serves as an advocate for pastors with little access to formal training and thoughtful cross-cultural theological engagement. You can connect with him on Facebook and Twitter.