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Best way to get weight on a horse asap ?
If you have any horse rescue centres near you don't be afraid to ask them as they will know a lot of great supplements :) I fed my rescue mare hay, lucerne chaff, oaten chaff and vitamins and within two months she looked AMAZING! Otherwise here in Australia we have a great brand called Teese Trades Stock feed (C3 feed) and that's what most rescue centres use here. Good luck!
Do you know good exercises for deepening your seat ?
I ride bareback, not only does it help with your balance but also helps develop your seat. Also do lots of stirrupless trotting and cantering and make sure you sit back and get your bum into the saddle. My mom always said "when you're cantering I want those heels to be down and I want to see you cleaning that saddle with your butt" meaning she didn't want to see any bouncing!