Hi, welcome to the forum. Nice to see you're wanting to research as much as poss first and you've def come to the right place! Pay particular attention to the stickies at the top of each section, they're deemed as really useful/important etc. I also found Tillie's recipes extremely useful as all the confusing ratios etc have been worked out for you, also I've noticed you've read Marie's guide which has supplements broken down onto daily recipes too, which again was a godsend. A lot of people (incl me) find the diets fairly tricky to figure out.
Ask as many questions as you want, apparently there's no such thing as a daft one, which worked out quite well for me, lol

As far as age goes, if they've been handles a lot then most people don't have many issues with older ones bonding.
Once you've made 10 posts you'll be able to view the classifieds section and post in there to look for breeders etc, there are some very good ones on here that know exactly what they are doing.
Good luck with reading through all the bumf, I'm sure you'll find it all extremely helpful
