fin/suncure qustion

hey guys amd gals. i found this forum not to long ago and have done alot of searching around on here. i like what i see. so anywho heres my situation. iv been surfing for about 11 years now. i started out on shortboards and am just recently converting to longboard because thats just more my style. i have the basics down. i can catch waves, ride, turn with almost anyboard i use once i get used to it. and i have used a wide variety of shapes and sizes. long story short...i recently bought a 9'' longboard. my first real true longboard. now i understand no piece of equipment is going to do the surfing for me, but heres my qustion. iv been dabbleing with cross steps latley and deff need more practice but i got it down enough to get on the sweetspot on the board and trim. once i go to the nose i pearl. now my qustion isnt what will make me nose ride. my qustion is how much will a better fin really help me? i actually read on this forum somwhere someone said somthing along the lines of equipment dosnt make us surf, equipment helps us surf the way we want. when it comes to nose rideing/cross stepping or longboarding in general im fairly new and know getting out there and surfing is the best solution. but the fin i have on it now is only an 8 inch fin i belive so i was thinking about looking into a new fin, i just dont know if its even worth the mony. opinions and advice are much appreciated. (i wiegh about 150. board is 9'', 23.5 wide and 3 thick and i ride mostly waist-head high waves, not to steep)
on a side note 2 kinda silly qustions. this longboard i speak of came with a 2+1 setup. since it was my first longboard i figured id try it and could always take them out, witch i did. iv rode smaller boards with single fins and just loved the archey turns. but now that these side fins are out, is there like a insert that should go in there so the bottom of the board is flush instead of having holes where fins used to be. and my second silly qustion, i just got back from a sesh and went to repair a ding on my board useing suncure. the suncure is prob like 5 years old by now and when i squeezed it out of the tube it was chunky and wouldnt smooth out or stick or anything. so does suncure go old? haha
sorry for the long and random post but any input will deff help my some. thanks in advance
on a side note 2 kinda silly qustions. this longboard i speak of came with a 2+1 setup. since it was my first longboard i figured id try it and could always take them out, witch i did. iv rode smaller boards with single fins and just loved the archey turns. but now that these side fins are out, is there like a insert that should go in there so the bottom of the board is flush instead of having holes where fins used to be. and my second silly qustion, i just got back from a sesh and went to repair a ding on my board useing suncure. the suncure is prob like 5 years old by now and when i squeezed it out of the tube it was chunky and wouldnt smooth out or stick or anything. so does suncure go old? haha
sorry for the long and random post but any input will deff help my some. thanks in advance