oddbean For BIAB you just need a bigger pot, a large net bag and a way of heating the pot.
For pot size I’d recommend 50L if you want to be able to do 20L batches of beer. You need enough space for all your water including any loses, and the grain without it spilling everywhere.
I think you can buy BIAB bags, or just buy some net curtain and sew one up.
For heating source you can go gas or electric. Gas tends to be cheaper to buy but more expensive to run. You need a pretty big gas burner, what in the US they call a turkey fryer. If you happen to be anywhere near Oxford I have one I don’t use anymore since going electric. Electric BIAB is a lot more convenient as you can do it indoors and typically the controller will hold a set temperature. You need a pot with an element and a controller, or an all in one unit like a brewzilla or g40.
For chilling you can use a chiller, or do no chill, by letting it cool overnight in a plastic hdpe water container (I did this for years with no issue, it’s very common in Australia due to the lower water use).
As your only home brewing you don’t have to worry about getting every last drop of wort out of the grain. Just accept it will be a bit less efficient and use more grain. If you use some brewing software like BrewFather you can record what you produce and it will calculate your efficiency, which you can use next time.
Recipe wise there is nothing special about BIAB, you can do whatever recipe you fancy. I’m always a fan of David Heath on YouTube. He has many good recipes and you can tweak the recipe in BrewFather to make it suitable for BIAB.
No idea on the malty taste, other than perhaps it is from the extract, sorry.
I hope that helps