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只得 means to have no other choice but to do something.
一行 means a group travelling together.
青苔 means moss.
天 means sky and has other meanings too.
在 means to be at, like 在哪里(zaì ná li3) means at where.
山 means mountains.
之外 means other than.
雨 means rain.
落花 means fallen flowers. A popular idiom would be 落花流水(luò huā liú shui3) which means to become a sorry plight.
台 means platform, stage or terrace.
我 means I or me.
两鬓斑白 are used together to form an idiom which means to be greying at the temples, growing old.
Hope this helps:)