First things first, sort out your hardware and software. Work out what you will need to use, eg. Will you edit as well as give the demo/presentation? Are you just interested video content? Will you use just audio? Once you have decided, see what you already have access to. For example, your university or college may already be using Microsoft Teams or Panopto. If not, assess what you need and install the appropriate software.
2. Work out what you want to achieve
Come up with a plan and stick to it. Podcasts can include demonstrations, presentations or discussions with one or more individuals, so planning is essential. Write a short script and get the sequencing right. This will help with timings.
3. Get Permission
If you are planning to demo software, use images or sound recordings make sure you have permission to do so. Also if you have a guest speaker or speakers, get their written consent before uploading your podcast.
Prototype first (even in a small way). This will make sure that the podcast flows and that you have enough content. A storyboard comes in quite handy especially if your podcast includes visual contents, for example a demonstration on how to use a library catalogue or legal database.
5. Find a Content Host
Where will your content live? If you are an academic or student then a the likely home will be your university website or approved 3rd party host via your university or college.