Hmm. That's actually an uncommon choice.
I like that.
None of the 'major' chapters are tan. There are a couple that are named but aren't really fleshed out with any background.
Thats not really a problem and its totally encouraged to make up your own chapter, but in terms of something that might help you, I'd check out the Deathwing Company of the Dark Angles. Most of the chapter is green, but their elite 1st company is bone colored (basically tan).
https://youtu.be/PayWCnv5xwY
As such, videos will be for painting terminators, but the fundamentals are the same for painting a regular marine.
What do you think?