Don’t be tempted to subscribe to magazine part works, go and buy a decent book on the area your interested in and follow it to the end. When you work out the cost of a part works magazine you could have bought 5 or so decent books a load of materials and one of Universal Art/Studio easel boxes to hold everything in.
You will only ever use a small portion of the stuff in a magazine and the focus is too broad, that’s why they have to provide free gifts to entice you to buy.
have three really good books on watercolor painting that I use albeit rarely these days but they did point me in the right direction starting out..
David Bellamy’s - Watercolour
Landscape Course. ISBN 0-00-412647-5
Bryan Thatcher’s -
Thatcher’s Way ISBN0 95379 850 X
Don Harrison’s - Watercolour
Troubleshooter ISBN 0-00-412984-9
Anything else I get from the web or really importantly through my local art society, Christchurch Arts Guild. I regularly go to local exhibitions and if possible meet and chat to the artist, analyze the work and try to implement any good ideas into my own work. I can now count a few as friends and when I can, go to art classes they run.
A word of advice there is a lot of snobbery in art circles, take no notice of any negative criticism just get on with your painting and enjoy it! Some of the greatest artists (if not all) were told their work was rubbish at some stage.