Oh and BabyLady does loads of comparison vids on her channel as well between different models which looks really useful. www.youtube.com/c/BabyLadyUK1991
Car seats are my thing really, more so than pushchairs. I can talk for hours about them
ask me anything!
They do need to be rear facing when they're really little yes. All first stage car seats are rear facing and even with the combination ones, they have to be at least 9kg or 15 months (depending on the seat) to use it forward facing. But it's safest to rear face for as long as possible. Young children are very vulnerable to spinal injuries caused by the head snapping forwards in a crash (think how adults can get whiplash) when they are forward facing, whereas a rear facing seat keeps their spine, neck and head all in alignment even if you're in a really severe crash. It's possible to buy seats today which will keep them rear facing until 18kg (3-4 years) or 25kg (around 6 years!) but if nothing else I would recommend maxing out the infant carrier if you're going to move to a forward facing seat next.
If you want to see the baby while they are rear facing you can either put them in the front, with your airbag turned off, or use a mirror in the back or if you're the passenger sit in the back with them. But you don't really need to see them while you're driving and some people find it distracting.
You can use the Joie 360 Spin from birth :) I am actually considering it for the first few weeks with DC3 because I really didn't like the fit of our infant carrier (Cybex Aton 5) for a newborn - will need to either get DS2's new seat early or borrow one for that period if I do this, though.
Not all car seats are the same, although in the infant carrier stage they are all pretty much as safe as each other, it's features where they differ. Once you move on to the next stage after the first seat, it's really worth doing research as there's a lot of difference between a seat that barely scrapes by the legal standard, and one which passes it with flying colours. Which? do some car seat reviews but they purchase their test results from a German company called ADAC who publish them for free on the internet, just in German! So you don't need to pay for a Which subscription. But TBH if you're ever in doubt just buy Britax. They are pretty much good at everything that they do!
For infant seats I'd say the safety related things to be aware of are any extra side impact protection, especially if you drive in towns or on country roads with blind T junctions, and any positioning inserts or recline features on the seat. Newborns can struggle with their breathing in a seat which is too upright but these days a lot of seats have good inserts to bring them up to a near flat position and some even recline which helps as well. But this is more of an issue if you think you'll use the car seat a lot or for longer journeys. If it's covid times and you'll stay in a lot then it's not really necessary, just comfort!