Cam / Compression Ratio

I know that I've been told this before and I tried finding it in my other post but had no luck and I'll write it down this time. Do I need to know what compression ratio I'll have before picking out a cam? I've been reading more about camshafts, I didn't even know what dynamic compression was until I joined this forum. Ivc affects the dynamic compression right? I'm wanting to get a cam that will work well with the compression ratio that my engine will have. I think that with all the help that I got here and reading more that I should have a decent running engine.