后果 usually implies negative results or consequences brought by an improper behavior/action. For example, 偷东西的后果就是被拘留 (Consequence of stealing is to be detained)。If the result is good or neutral, you should use "结果"。
”大“ cannot be used to modify 结果. it usually indicates size or scale of tangible objects. Just 结果很好 will do.
As for your last sentence, it is actually a question. You need to add "吗" to indicate it's a question. for example, 中文有类似的说法或者成语吗?