To reply to your specific eyebrow question, and sort of generally reply to your intro -
First, I'll assume you go to a salon to get your hair cut. Most salon's have an esthetician to help you with exactly what you ask. Nothing beats having someone show you in real time - no book, no email, no forum post, no video. You don't even have to tell them your trans., just tell them that as you've aged you've begun to lose some eyebrow hair and you need their help. They may also be able to help you with minimally invasive

make-up. You may get stuck with buying the salon's brand of make-up at exorbatant prices, but my experience is it's money will spent. And after you get the knack of it, you can shop at the local discount store.