Most problems with bagged soil come down to two things: it stays too wet, or it's so hot with fertiliser that seedlings burn. A decent indoor mix feels fluffy when you squeeze it, holds together loosely and drains within a minute or so. Target a soil pH of about 6.0–6.8 once it's watered in.
If you don't want to feed much, a living soil with compost and organic matter does most of the work for you and you water with plain water for a long time. Otherwise a normal pre-fertilised mix plus a bit of perlite is fine. Look at our soil mixes and living soils, for example Monster Soil 11 L.
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