sdashm,

I think you might be referring to what special needs there are for a bicycle for a plus size person? If you're new to cycling or cycling again as an adult I'd say that you are probably casually riding at this point and most bikes will probably be fine for casual rides up to 250-275 pounds. Much more than that and you might have to look for different wheels so that safety is not an issue. You can check your bike out at a local bike shop. If you explain you bought a used bike to know if you'd like biking, a good shop should understand that and help you out so that when you are ready to upgrade, you'll come see them for a new bike. Most bike tires have a range of how much PSI to fill the tires up to, if you're plus size, use the higher number to inflate the tires to.

For starting out you can wear anything that's comfortable, just beware of loose flopping clothing that can get caught in your tires, chain or on the handlebars and saddle when you are getting on or off the bike because it can cause you to fall, that's one of the reasons that cyclists wear form fitting clothes, among others.

Welcome to TE and I hope you fall in love with your bike like most of the ladies around here!