Galveston surf fishing March

So im thinking about going down to Galveston over spring break. I would to target sharks,bullred, black drum and jacks. I have an Avet LX 6.0 spooled with 300 yds. of 65lb braid with 150 yds. of 80lb topshot on a custom FTU surf rod. I also have a Penn senator spooled with 440 yds. of 40lb mono and a Penn defiance spooled with 300 yds. of 65lb braid and 80 yds. of 40lb mono. I make casted shark leaders like the ones on Texassharkfishing website. I have also made a few fishfinder rigs. Both of those rigs have 12/0 and 9/0 circle hooks on them. I have various size spider wieghts going up to 10 oz. so I dont think that will be a problem. What kind of bait should I try and use? I have a castnet. My main concern is that I dont have a kayak. How far out should I try to get my bait?