I'm a VERY lazy gardener, and had no previous experience before we moved to a house with a garden 13 years ago. My tip is this - all my plants basically have to able to survive by themselves!
I initially worked on the basis of seeing what grew well in others' gardens nearby (or what was already self-seeded in mine), and working with that. It's always trial and error, and I've had many things I've grown from seed not thrive, but you'll find other things do OK.
I have loads of valerian, wallflowers and blue thistles in one bed, with masses of sedum for autumn colour and winter structure. They have loads of mad honeysuckle growing up a wall and trellis behind them.
In other beds (shady) I have lots of shuttlecock ferns, hart's tongue ferns, shady spurge, climbing hydrangea.
Then another bed (north facing), I have hellebores, lady's mantle, same fern combinations, and absolutely rampant wild strawberry plants that my husband put in a small section for cover 🤔
I have an enormous Generous Gardener variety rose running utterly wild, and others that I grew from.cuttings of the original GG also now taking off.
I tell you all this because I do naff all with it most of the time - these are all plants that it's really easy to dig up, divide and replant, they don't need.a sensitive regime, many self-seed so you get more for free!
I promise.you'll have successes and failures, but I have a well-stocked garden full of frogs and insects and birds after many failures of lots of plants, and with a shameful lack on input!
Go easy on yourself (and if you find you're not actually enjoying it, that's OK too 🙂)