My local area didn't have any houses mapped, so I started out with the iD editor. It's extremely easy to get started with. It even has an interactive tutorial to get you going. After that I moved on to JOSM to edit more efficiently.

The OSM wiki has a lot of good resourced about all kinds of topics. Something I would suggest you look up is how you're region/country likes to format address data.

And finally whenever you commit a set of changes there's a check box you can tick to ask for someone to double check your changes.

I'm seeing this post so late, probably you already found a way to add this info, but just in case.. For me the easiest a way to contribute is just using iD editor in the browser, you just go to OSM, create an account, zoom on the area you want to contribute and then click edit. This editor has everything you need and is easy to use but it may be a bit daunting the first time. If you are very new to this just check how other users gave tags to the near buildings created.

For the apps, I only use them to contribute very small things like adding a missing restaurant, I'm not sure that you can even use them to draw buildings and name streets.

As a more advanced editor you have JOSM, but since you seem new and looking the easiest way, the iD is just fine.

Check out https://streetcomplete.app/

It is like a simple game app where you walk around your neigbhorhood and answer questions to fill out missing data in the map.

It is actually pretty fun 😄

So the unnamed streets near you will pop up as quests where you can name them.

A week or so later, the data ypu contributed will be public in OSM.