What bike is recommended?
Use a local bike shop (LBS) who can give you good advice and proper servicing.

Don't be tempted to get a big that is too big for you; reach is more important than height. I often see people over stretched. Also go for a bike that is well built rather than a Walmart 'bargain'.

Good bikes last for years and years and are fixable. Modern bikes with decent wheels and brakes are often cheaper than buying an old boneshaker. Spend the extra for reliability and make sure you get a decent lock so it isn't stolen the first time you turn your back.

Keep you tires properly inflated (60 psi minimum) and take advantage of your LBS's track pump for a top up every 2 weeks or so.