You can get one of those doorway pullup bars from Amazon, or maybe even your local thrift store if you're lucky. Going to the park to do pull up is a great option when the weather permits, but since this is a home fitness subreddit, these are some options.
If you decide to get resistance bands, you can buy a door anchor online, like this:
If you don't get around to getting any of these things, don't sweat it. The fact that you're starting to get back into shape again is a huge accomplishment in itself. Plus, you can get really creative with bodyweight exercises alone as there are many tutorials online and in this subreddit as well. Good luck to you!