I am new to brewing like you and have only been obsessed since February this year. I will document my short journey in the hopes it may help another new brewer. I have a friend who has been extract brewing for 30 years and the beer has never really changed, and while I wouldn't say it is horrible it isn't really something I would prefer to drink (if he can't do a brew for $20 he won't do it, but I suppose he drinks beer for a different reason then me). I thought to myself there must be better ways to make beer and it was a bit of a personal challenge to me to see if I could do it.
My first brew was an extract IPA (LME, DME, crystal steep, a few hop addittions in the boil and a dry hop), I think I got lucky, the beer blew me (and him) away, from that point on I was obsessed with brewing. I did a couple more extract brews (one not so good) and decided I wanted to move to AG like you, but which way to go, I looked at the Robobrew (to me it looked cheap and flimsy), I looked at the Grainfather (looked good but expensive and I wanted to make bigger volumes) and settled on BIAB because it seemed to tick all the boxes for me including the budget.
My first bag brew was fun, the beer was great but I wanted more. I decided I would build my own Grainfather-esque system, it would be easy to add a malt pipe and pump to what I already had - a 50L boil kettle with electric element. I didn't quite get that far, somewhere along the way during countless hours of research on these forums, other forums, youtube, several brewing books and whatever I could find on the internet I ended up putting together a 3V HERMS, so to my original 50L boil kettle I added a 50L heat exchange, 57L mash tun and a couple of pumps.
I am about 12 brews in and like a kid in a candy store, I brew every weekend (sometimes both days) and I am over the moon with the results. Mid April I bought a 3 tap kegerator and have been kegging my beer since. Honestly the beer is that good I can not keep up with demand, commercial beers I used to love now taste stale or watery and friends rave about what I am producing.
It has been a whirlwind journey in the short time since I put my first extract brew down, but I am now where I want to be, although I still find myself tinkering most weeks with little changes to the system and I have just got all the gear together to build a counterflow wort chiller. My advice is to read and watch whatever you can find, see which method of brewing gets you fired up and go for it, you won't be disappointed whichever way you go.
Cheers