I'd suggest that the first step in your action sequence, or rather the first intermediate goal you should set for yourself, should be to find just one other person, one other musician, with whom to get things started.
Ideally, it should be a compatible person, with similar tastes, with whom you can already start trying out some ideas. And you can already start looking for such a mate even now, during the lockdown period, why not. You can talk online, share ideas, etc. And at the first opportunity, meet somewhere and try playing together.
If you play bass, this first person could be a drummer or a guitarist. In both cases you'll already be able to get something started.
If you can get this done, you will have reached an important milestone toward eventually forming a full band.
And if you don't already have friends with those characteristics, try local ads, online ads, etc.
Again, the main principle is that you don't try to create a whole band all at once, but try instead to find one good person first, then after some time, if things gel, look for one more person that both of you will like, and so on. In this way things will always remain fairly simple and you'll gradually learn along the way whatever you need to learn.