2x a week is perfect for you at this point. Your body will not be able to take more at first. You will probably feel out of shape, even though you workout, but dont worry about it, the cardio gets better.
As far as finding a school and price, yea they dont mention those online. Go to every school around you and try a class or two. See what the instructor is like, see what the class is like. Do all of the students introduce themselves to you or do they stare you down like they cant wait to kill you? Makes a big difference to us who are older and are doing this for fun, not to be the next world champion. Ask the instructor a lot of questions, like about price, contracts, if they let you out of contract if say you lost your job/had to move, etc. Also, ask them where they learned BJJ from, they should have a lineage and more than likely be a brown or black belt (some purple belts teach too). I am not sure what average pricing is around you, but i have trained at 3 different schools due to moving and I usually see anywhere from 80-125 for BJJ and sometimes that includes other arts as well such as boxing, muay thai, or mma. Again, though check out all the schools in your area.
btw, im 32 with a kid, house, full time job, etc. I can train 2-3 times a week sometimes more/less depending on the week. Ive been doing bjj on and off for about 3.5 years now and am really glad i got into the sport.