First Press and ADVICE needed!

I've always done things digital and I'd like to get my first offset press ever.

My main motivator is lower cost per print. I do equal amounts of 2 and 4 color but something that prints full color on envelopes would be nice.

I really have no clue what brand, new/used, model, or plates, etc. to use. Volume would start on the lower end but increase.

Thanks for your help,
Patrick