You should take a lesson, even a group lesson works well for many beginners. A typical package of 4 or 6 group lessons over the same number of weeks with personal practice between would be ideal. For people like me, i like a group lesson not only because of economy, but it allows me to process stuff more easily by watching a range of responses from others in the group.
But if you can't, the easy summary of skiing is to keep dynamic fore-aft balance, and control your edges. Control your edges means being able to use any section of them anywhere along the ski. That's about it.
To get you safe on "steep" blues and hopefully not add too much to bad habits:
Do stork turns on green terrain until they feel sort of natural. Maybe not all in one day out.
Reason for stork as opposed to javelin or get-over-it if you are self teaching is that the last 2 can be cheated, and often are, by people initiating by leaning back. You need to lean forward and balance over the toe of the outside ski for a stork turn, and it starts dorsiflexing the inside ankle.
When you can drive and carve the single outside ski (or controlled skidding turn), go to a groomed section of slope that seems "steep" in your estimation.
Point your parallel skis straight down the fall line. Dive and fall forward right out over the tips and keep facing your fall & torso down the fall line as you pressure the outside ski like you felt in a stork, and keep that pressure on until the ski comes around under you & forces you uphill to a stop, or to a speed you feel completely comfortable falling straight forward down the fall line again and pressuring the opposite ski to go the other direction. Don't do it half -ashed. Dive straight into your discomfort zone fully committed and trust your skis to do what you practice in the stork turns while staying fully in a forward position until stopped. If the slope is off -camber and you dove the wrong direction, don't get confused mid carve (or skid) and try to reverse. Keep the turn going hard until you are back up and slowed or stopped.
Focus on driving the fronts of the skis, if you do not commit to fully forward you'll never get the tails of the skis around under you. Torso needs to be perpendicular to slope, not to gravity.
There are still plenty of bad habits that can be accumulated here, but it is a start with a tool you can build on.
If you really want to progress, get on you tube & do all the footwork drills every time out, on greens. You can't drill to perfection in one or 2 sessions or maybe even over a lifetime, we all go in and out of practice. There are plenty of muscles involved in efficient skiing that some of us (myself included on my broken side) barely use in regular walking. Just keep doing a mix of footwork drills every time you ski. Over a season (20 - 30 x out?) each will get more natural and you will unconsciously entrain the muscle movements and increased muscle strength into your skiing. Watch the videos especially focusing on where they show you how they can be done incorrectly so you can minimize the bad habit accretion.
smt