Hey man,
Finally got the time to reply to you but I'm keeping my promise 
Coming up with ranges is very hard to do if you don't know what you are looking for but I will try to give you some advice that can help you.
1) positional awareness
2) understanding what cold call ranges roughly look like from other regs and how our hand does vs it.
branching off from that
- game plan vs 3bets
- game plan postflop
3) implied odds
-balanced/vs exploitative approach
4) understanding how equity is spread by each hand and why one hand is better to pick than another
So let's go through the list. I'm sure you have seen the video by pleno for UTG game plan which is quite good so I will use that for an example.
His range for raise 1st utg was something like T8s+, 89s+, 66+, AQo and AKo.
1) we realize that we are OOP and need a tight range. we check to see who is in the blinds and can open wider.
2) people will typically flat a fairly strong range vs utg and you won't to have a range that plays well vs their cold calling range, ie their range doesnt dominate some of our hands, raise hands like a7s in ep as a standard will be quite bad becase people flat Ax that dominate us plus when we flop a pair we are not happy either.
3) so pleno talks about how 22-55 how quite bad implied odds and rather raise T8s/J9s which he thinks is more profitable. His range is not balanced because it's not as strong on a 235 board for example because he never has sets there but we are not super worried about range protection on this board because we have every overpair in our range however we prob lose with 22-44 over a decent sample.
- typically we want to defend at least 1/3 of our range which you obv know so we just do range x .33 and from there we decide how to pick our strat vs 3bets. Pleno covers this pretty well with how he splits his range into 4bet bluff/value + flat and + flatting strong hands to protect his range.
-coming up with pretty good cbetting game and plans for turns and river of course.
4) lastly this is prob the most important. Until you understand how equity is distributed from hand to hand you won't understand how to pick your hands yourself and therefore you need to play around with equilab, do k2o vs 100% range, then do 46s vs 100% range. Then come up with some random boards and some turns and see how equity changes. I will get you started: 46s will typically have more spread out equity from flop to river since it's more connected.
Like I said I'm not here to give you some formula on how to play and you wll benefit the most from doing the work yourself but I think all of those things are pretty important to consider and play around and come up with your own ranges.
I think typically BTN raise 1st should be like 3x utg Raise 1st. Since we are typically going to be raising smaller size and getting a much better price on our bluffs and we have position vs only 2 opponents left to act and thats quite huge.