OP- what fuel is your aga? Oil, electric or gas?
We bought a derelict property a few years ago which had a 1990's aga in it. Ours is gas. It is had been electric or oil, we wouldn't have kept it. I'm a competent cook and make nearly every meal from scratch. It did take me a while to get use to it but I love it now.
When we renovated, we added a 2nd oven which we use in the summer when we turn the aga off. The ovens are very deep, so there is more space than you might realise. Did the previous owner leave you any pots/pans for it? I initially used what I had, but the trays that fit the runner are very good. Aga pots (see pic) can be stacked which is great. I bought all of mine from ebay for a fraction of the cost of the new ones. I also bought a Mary Berry aga book for about £1. You tube also has lots of basic tutorials.
As someone else said, you need to get used to using the ovens more and the stove top less. Even for veg and steaming veg which took me a while to get used to. Heat comes from all sides in the aga, so it makes the most incredible yorkshires and pastries, pies etc.
I have a drying rack like the photo. It folds down when not in use. I don't use it when cooking though and have never had an issue with clothes smelling of food!
If you mix your porridge/water or milk at night, you sit the pot at the back of the aga on the left- on the top of it- not inside. By morning its perfectly done!
I have chef pads on top of each lid. I can then put a hot pan from the oven on top without scratching the steel. You can buy all manner of colours and patterns, but IMO, plain black on both sides is the best. Any other colour becomes filthy from the bottom of pans. I did have Christmas ones I bring out, but the rest of the time, they're just black.
Bake-o-glide make circles that fit the aga top. You can then make toast, cook eggs etc directly on it. Aga also make a round toasting rack, but I only used it once as found it just as easy to put the bread directly on the circle. Bake-o-glide also make lots of other shapes for pans. I did find a rectangular one at ASDA for a fraction of the cost which I use on trays. You can also buy circular things that attach to the open lid and protect the inside from cooking splashes.
I don't know about oil/electric ones, but ours is gas and gets serviced every 1-2 yrs depending if we turn it off or not. I rang 8 companies before finding one that covered our area AND could do gas. The aga website has a list of engineers on their site, but the vast majority no longer did aga, didn't do gas or didn't cover our area- despite the website saying otherwise.
These is an entire thread all about agas which I'll try to find.⭐️All Things Aga Related⭐️ | Mumsnet