I’d also recommend getting cellartracker.
It’s both web based and an app.
When you start to accumulate bottles it’s a great way of keeping track of what you have. It can tell you how much you have from each region, grape variety, when they are ready to drink etc.
That also helps you see that you have been, for example, been buying too much Bordeaux and not enough Italian. It may show you you don’t have enough wine ready to drink now.
I can see now that 60% of my wine is French, (40% Bordeaux, 12% Rhone, 4% Burgundy) 10% Italian, 9% Spanish, 5% American, 4% Argentinian, 4% German, 2% Chilean and a few odds and ends from elsewhere.
There is a link somewhere here to those of us who have shared our cellartracker details so you can connect to us and see what we have.
Here it is - Sharing cellars on Cellartracker - WIKI
I agree the Vintage Cellar Plan is a great, easy way to grow your collection.
En primeur offers are good too.
You also need to pace yourself with the EP purchases, unless you dont mind your cellar being full of wines from the next few years and then not much after that as it’s full! Unless, of course, the next few years are stonking vintages in which case you may want to get stuck in!
As a generalisation red wine will be better to keep long term, although there are certain white wines (eg any riesling) that will age beautifully, Jancis wrote something on this very recently extolling the virtues of age worthy white wine.
Just enjoy building your collection!