Welcome
Noticed your post had gone unanswered for a few hours.
Welcome to the Forum!
I'm also new here and back on the bike after many years in an attempt to further/speed along (pun intended) my own weight loss.
I'd suggest going a couple of local bike stores, finding something you like, is in budget, comfortable, and returning to the forum for opinions on your selection prior to purchase.
I hate to see the new guy's post go unanswered, but seeing as you didn't ask a specific question, responses tend to be a little slower.
All the best
Barry