How to start an online liberal arts undergrad?

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tl;dr soldier looking for a legit online bachelors in liberal arts achievable in 2 years

I'm on a career path for linguistics, and I'm in the military. I am working fervently to get a bachelors degree (already got an associates), which I want to achieve in ~2 years, the end of my contract, so I can immediately start working on my graduate degree after I get out. I have been told by my advisor that it is possible, but he works at a glacial pace, so I want to start looking on my own to make things faster. Due to where I am and how I work, it'll be impossible for me to attend a brick-and-mortar institution, so I am opting to take online courses (my advisor recommended that I take a liberal arts undergrad in foreign affairs or language with a minor in computers). Does anybody know how to get the ball rolling in a timely manner on these courses? Anyone here have any advice for this path or counsel against the path I am thinking of taking? Thanks in advance for any input I can get.