If it’s at all a possibility I would recommend seeking out whether there are any local people interested in lichenology and seeing if you can join them on a field trip or similar.
IDing lichens from first principles is tough; most of the serious books are written for people who already know to filter out the common species and who need to cover everything, and so especially with crustose species will often require microscopy and chemical tests very early on. These are invaluable for the experienced but for a beginner trying to learn the most common species it is like trying to learn to recognise a hazel by counting stamens in the catkins or your friends by measuring the size of their ears.
If finding like-minded people is not possible, iNat might be the next-best thing you have; I learnt a lot as a beginner by simply watching what other people were observing on a national reporting platform here, recognising similar things, and trying to look up descriptions on the internet about whether there were any immediate lookalikes, and then occasionally getting feedback from IDers when I’d messed something up. (Btw, if an IDer makes a disagreeing ID on something of yours and you’re trying to learn, make sure to ask why if you want an explanation. Most people are very willing to explain things if it is obvious that you are seriously interested if a novice rather than simply throwing things at the CV and seeing what sticks, which can otherwise be hard to tell.)
Regarding looking things up on internet sites, it can be very useful, even if they don’t cover your are specifically many species are still shared between e.g. the whole of Western Europe. One site I like that hasn’t been mentioned yet is http://www.lichensmaritimes.org/index.php?task=accueil&lang=en
Be somewhat careful though, especially if venturing onto less serious sites, I tried searching for things that might be worthwhile to your specific area and as a particularly egregious example I quite quickly found a blog post claiming to show pictures of 30 species lichens of which at least 9 were obvious and frequently severe misidentifications.
As for books and the like that might help specifically in your area the only one I’m aware of is Mediterranean Cladoniaceae which is available as a free pdf: https://mariomairal.com/wp-content/uploads/2020/10/Burgaz-et-al_2020_Mediterranean-Cladoniaceae.pdf
Cladonia is certainly not the easiest place to start though even though many of the species are large and attractive.
From what I have heard this book is good but it is almost certainly not somewhere you would want to start as a beginner, being an expensive technical detailed monograph of a group of frequently very small and inconspicuous lichens in a very specialised habitat.