Hey everyone!

Hoping some people here can help me out. Loved poker for years, and now that I'm living in NJ in the US, I'm able to play online on a regulated site. I dove into studying, taking it seriously to get better with a goal is to be playing at 25NL a year from now.

To start, been spending roughly 90% of my time studying / 10% playing since I am a losing player, and only playing at 2NL at the moment to get my fundamentals down, and since I'm a losing player right now, might as well lose the least amount possible while I learn. Once I feel comfortable with my game, going to deposit more and start playing at 5NL / 10NL depending on the tables running (not the best player count in US regulated sites.) I stick to 2 regular 2NL tables, and try to really focus on certain concepts/topics I've been studying to apply them.

I could use some advice on a couple different things, any help would be appreciated:

1. Iso Range*
First thing it would be great to sanity check is my default Iso range. Haven't really been able to find much on this, so want to make sure this adjustment is a good one. At 2NL there's a large number of players with a 40-50% VPIP that are limping, then calling an iso-raise, whether it's 4bb up to 6/7bb, and usually it's at least two.

Almost half of my hands so far (only 7K-ish at the moment, low sample size) have been been multiway pots. After realizing I'm getting called quite a lot with these raises, I cut down my range that I isolate with pretty heavily, to roughly 12-15% of my hands, since when I'm getting called this much, I want to go into these flops with a relatively strong hand compared to the limp/calls. Is this a solid adjustment, or too tight still?

Rough idea of the range :77+, A2s+, KTs+, QTs+, JTs, T9s, 98s, 87s, AJo+, KJo+

2.) Identify Most Common Spots for Study / PokerTracker Filters
I've looked this up a bit but would be great to know people's thoughts on the best spots to study as a beginner, excluding RFI ranges? (Practicing those daily, got them mostly memorized).

I've been looking at my hand history in PT4, but would be great what filters / spot to look out for when it comes to reviewing common spots, outside of the ones where I lost a stack / a lot of BBs.

3.) Any other tips!
It's always great to hear from others with the same experiences!

Thanks!