I'm a new player and have been playing since last week. Gave it a shot as a saw it on the steam store. Before I played some shadowverse (about 40 hours).
Since I installed MTG Arena I already have 13 hours in total played. I like it so far (except when I get comboed out of existence ...)
Finished the colour challange and now I'm about to finish the starter deck challange. After that I'll give "Jump In" and later down the line Quick Draft a try to grow my collection.
Also build my first red and white deck without any guides and managed to get a win on my first try.
I'd advise on holdin off draft until you've built some decks on your own, since deckbuilding is the most important skill in draft. Try to find the flaws each deck has and which cards are stronger than others(considering many possible cases, otherwise you'll just find situational ones).
Last but not least: the less cards your deck has, the higher the probability of drawing that very strong one early.
Depends on what you want. Jump-In offers a lot of value with 2 rares per 1000 gold and its always an even match since your opponent is always playing jump in. If you want to build a specific deck, playing constructed and buying packs will get you wildcard/gold pack prizes for the rares you'll need. Drafting is the most gold eviction if you're good, but you should make sure you have the fundamentals down and look at a drafting guide for the current set.
Definitely jump in so you get some commons and uncommons to get some bulk for your collection, then some constructed so you up a little your rank and get the end of the season rewards
It's a lot of fun, and easy to play even without spending money! I only use the free coins and am able to get into the events pretty easily. I don't love the draft because it lacks the give and take of real life, and I usually avoid it since it costs too many coins. The jump in is a lot of fun when it comes with new sets, highly recommend!