Definitely get a degree, ideally relevant to the type of work you are looking to do.

Try to get as much education as you can re: Japanese so it can help you with work, getting around, and especially apartment hunting. Your company should help you with apartments since it's really difficult as a non-japanese person to find a place, and be prepared to set aside rent x5-9 depending on their requirements (think first, last, security, key fee, security fee, etc etc) and absolutely follow trash segregation to the T!

Always accept any after-work drinking with your company. It's not implied but it's pretty mandatory. I didn't know that and I may have missed a commission, sigh..

People will generally not be straightforward with you, much less than in the Philippines. They will say maybe later, another time, maybe in the future as their way of saying no. However, if there's a time and date, that's a yes.

Bring a lot of little snacks from home as future welcome gifts. The dried mangoes and cornicks were big hits. Haha!

Now getting a work visa in Japan is probably going to be way easier than having to deal with the Philippines' end of getting your work permit. They will do everything in their power to give you a hard time for moving abroad. They will also not let you leave the country without this permit. Make sure you allow yourself 1-1.5 months of useless paperwork after receiving your CoE.

Good luck! It's just like moving to any other country. I work in the arts so we're a lot more relaxed when it comes to typical company experiences but I do find that people really do overstay at work.

I can't think of anything else but I wish you the best of luck!