That's why you have to build a town, city, or other scenery on the layout. Circles are plain-ol' boring, and don't go anywhere except back to where you've already been.
Agreed, inspiration is often required,look at your best most realistic rolling stock,then Google it for real photos until you come across something you think you would like to model,once you have a real image things fall into place quite easily, look at shunting puzzles also they give plenty of interest and playability, round and round tends to be quick but boring,you need a figure of 8 if possible, a pair of tracks if possible and a straight run at least a third of the way at the front for a platform you can work on. You do not need expensive items, peco has some interesting items easily updated,it is not about expense, I would invest in a short back board,painted plain blue,a few branches,sone terracotta paint for earth….oh look hang on…..
essentials to a quick layout
1. A board of a size that you can permenantly keep horizontal otherwise there is little inclination to model scenery
2. A short backboard painted light ish blue
3 some earth coloured paint, terracotta, look at house paint testers especially if reduced, they go quite far
4. You need a straight line if you want a platform,stopping point, and room either side for trackside building and essential detailing, a pair of parallel tracks is preferre, and a gap between for any scenic items such as track control
5. You need an era, a decision on the station if less buildings go rural, if you desire more buildings then adjust, personally if first time a small rural is likely easier and can be incorporated into a bigger area
6. Era is all important buy a few cars, get a couple of people invest in a specific time, your childhood if you were around railway is popular,something you know is always easiest
7. Paint the base an earth colour, invest in. Some PVA and some greenery, I would say in general do not paint grass green paint is shockingly hard to look good
allow for a road way to the area and a space for a little non railway scenic, although a signal box nearby is useful, a cottage is often a good choice set up a garden a car parking area, pop a few cows or sheep on a bit of grass, you do not need expensive static grasses, a plastic bottle to shake it in will provide enough static to do a decent job.
if possible keep rolling stock together in context, although a preservation station allows for plenty of choice, any cheap junky wagons should be considered as weathering opportunities, as cheap test items.
these will get you up and running, look at the likes of Willies layout carefully he has the perfect opportunity for you to see areas slowly building up to well developed areas that photograph beautifully.
the art of this is to enjoy, and not stress, keep it simple,you will gain confidence slowly,and can ask constructive questions as you hit specific problems, and keeping it child friendly with occasional non real creatures etc is perfectly acceptable, this is about enjoying the hobby from as many angles as possible, and keep it child friendly can be a grandchild or your own inner child, but being able to have a vanilla - ie realistic option will inevitably leave more credability with a wider audience, which is why I personally do both.
town planding is liquid and moving bits around and testing is best
i personally like foam I can push trees etc into p,ace not like the result pull them out again with minimal fuss
from this to this
I can also make platforms to size, insulation sheet at 25mm is perfect for 00,