welcome!
Hello Maureen! I am a new kid on the block here, too. I'm finding it's a lot of fun hanging out here.
I have an Independent Fabricators bike that was made specifically for my body geometry & absolutely love it. I rode thousands of miles on a Lemond that "almost" fit - I loved it, too, but there were those little nagging aches and pains that would never go away no matter how I tried to make that bike work. So....depend on your brother to fit you with the best bike for you & then HAVE FUN!
And I agree with Lisa - you won't have one pair of shorts & one jersey long. You should see my closet!
"When I'm on my bike I forget about things like age. I just have fun." Kathy Sessler
2006 Independent Fabrication Custom Ti Crown Jewel (Road, though she has been known to go just about anywhere)/Specialized Jett