It was great to see you.
I started reading with “Cwm Grachod” then “Coed y Brenin” by Colin Jones published by Cadw sŵn. Unfortunately I lent them to someone some time ago, and I can’t remember who it was. Colin Jones wrote them for his own students and they have plenty of vocabulary and explanation.
I moved on to Ffenestri by Lois Arnold. It has short stories at three levels of difficulty, and I really enjoyed it. There is also “e-ffrindiau” by Lois Arnold. This was OK at first, but I rather lost interest part way through. “Sgŵp” by Lois Arnold is a great story, and worth a try in a little while. The Blodwyn Jones stories by Bethan Gwanas are popular, but use a northern dialect which I found more difficult at first, being a southern learner.
There is a good series “Cyfres Amdani”. At Mynediad level I have read “O Gaerfyrddin i Go Compare” which is the story of tenor Wynne Evans. He learned with SSiW. I have also read “Stryd y Bont” by Manon Steffan Ros. This is a very clever miniature thriller using easy language. After that there is a wide choice. “Stori Sydyn” is another good series of books, though it doesn’t include vocabulary, being aimed at reluctant readers who may be fluent in speaking Welsh.
Do you like “Mog the Forgetful Cat?” If so, then try “Mog y Gath Anghofus”. You can download a soundfile of someone reading it. I will try to find where it is and post a link. There is a very long thread of book suggestions on this forum, but it might be a bit overwhelming at first.
If you go to BBC i-Player and look for S4C, you will find a whole lot of children’s programmes, and also programmes for adults. You can watch them with subtitles and it’s all good even if you don’t understand much at first.