Welcome, and getting lessons from another woman is a brilliant idea. Learning anything from your SigOth is usually trouble brewing. My tips-
1- Good helmets are worth every cent. Always wear it.
2- Don't let anyone make you go clipless 'till you're ready. There's no shame in using BMX pedals on even the trickest MT bike.
3- You can learn a lot of incidental stuff from magazines (bike porn ) like Mountain Biking or Bicycling. An awful lot of women I've talked to started this way. And anything from eNd Overend just rocks. That's the greatest mountain biking/ punk rock name ever, as well as him being a master technician AND able to write well about it.
4- You need to ride often so your body can learn. Make sweetums do the laundry, you need to ride .

Miss Liz