Trolling is easy...no need for fancy rigs.
First...you can buy an umbrella rig in 2oz to 6oz lead attached to the rig.
I like to use the 2 or 4oz rig.
Now......let go with 2oz rig and 12 lb test.
If you let out 150' its going to put you at or around 15 to 20' deep.
Thats a guesstimate from my past use.
or do you have somthing else in mind?
What type of lure you looking to troll?
Stripers like a bit fast on troll speed.. 2 to 4 mph is normal.
Just kick off the throttle and in gear.
Remember....big baits gets you bigger fish.
Caught this fish somewhere in california.