The first thing one need to focus on is to devote at least 20-30 minutes a day, at least 4-5 days a week. Tell your friends and family members that you need this time off to practice. Very often, adults fail to allocate a specific time for this learning and practice effort. Just like any younger learners, we adults need to spend quality “uninterrupted” time for practice.
The next thing that will help you is to keep track of your progress. Whether it is a new song or same scale/arpeggios you are working on, you need to keep track of your progress. Here is a link to download your practice log
Also write down your short term and long term goals.
Invest in a decent quality keyboard/piano. I would recomend a touch sensitive full size digital piano for beginner. Once you are working on technical skills, be prepared for a digital piano or acoustic piano that can help you build stronger techniques.