You can go higher than 4lb, especially braided. I use 10 but likely overkill. I don’t like losing lures to trees, logs. Make sure your reel winds fast enough. Mine is 6:1. Some small reels the crank ratio too slow. Always fish upstream.
Fish MN or WI? If MN google Minnesota trout stream and you will find maps. Easement in gray. WI has a separate easement database. PM me I will give you spots. Ask friends for spots. Or google “GIS map + county name” to get GIS maps. ID owner, find number in whitepages. Call in advance, ask permission.
Spinners and worms a good place to start. For spinners you will have best luck 5:15 am – 7:15 am or maybe later. Pick a cloudy dreary day. Even light rain helps. Worms best early morning or late evening, or all day it just depends. Right now worms have been red hot. Use #6-8 hook, split a foot up to cast the distance. Think where the trout is gonna be. Cast three free or more above trout. Keep a low profile. If tall banks stay in the water.
Technically if you access at a public bridge and keep your feet wet surrounding private property you are legal. Ask permission though, landowners appreciate this.