Just work on technique as number one and then get good gear and flatwater paddle up are not that hard. Paddle does not really matter that much as long as it's not a cheap flexy crap paddle, blade size everone is saying go bigger but really it's not a huge deal and to be honest if your technique is not great then way more chance of shoulder injuries with an oversized blade that really is not needed. In the vid below my blade is 84sq and I get up in 6 strokes.
What wing you learn on makes a big difference as there are now a few out there that make flatwater starts easier. Just because it's a big wing does not mean it's good either.
Mast I use a 80cm or 84cm depending how people want to measure it and it works sweet. 100cm might be pushing it though.
Board length helps and going narrower heaps bit to long sucks as soon as you leave the water. Mine in the vid is 7'2.
I'm 47 and 78-80kg
Ang who is also on the vid below is just learning to pump up in the flat so you can see between the two of us technique is the main factor.
She is way lighter and in theory should get up way easier.
www.instagram.com/reel/CvjcbRlt9QD/?igshid=MTc4MmM1YmI2Ng==