There are a number of approaches all dependent of what you are looking for in the end game. If it is a full complete education (degree + license) then one of the academies is well worth considering. All have their strong points and any of them will get you there. You are looking at a timeline of 4 years in addition to the tuition costs.
As mentioned AMO has a 2 year program that maybe worth considering. If accepted and you make it through you can get your 3rd’s license but understand there is a commitment to join the AMO and sail for 5 years (I think it is only 5).
There is the SIU’s Apprentice program, if you can put up with the accompanying BS, will get you started. (The BS part is just one of life’s lesson’s, IMO) The time line to get a license is definitely longer but all the training required is available via their school and a means to work. There is also a way to earn an Associate Degree if that is something you really, really want.
There are other schools such as Seattle Central College’s Seattle Maritime Academy (Junior College) that may fit the bill to get one started but it is not a license program per se.