Ok an if i do the 1 scoop an pitcher of water how often do i feed it ?
You'll only water when the soil is dry. You can dig a finger into the soil and wait until it's dry down to the first knuckle. A better way is to wait until the leaves droop, lift the container to feel how light it is (it will be amazingly light). That signifies "too dry." After that you can lift your container and gauge whether it's ready to water. (Letting the leaves droop doesn't hurt the plant much. It will bounce back 30 minutes after watering. But, it is a stress. Don't do it a lot. And, don't do it to young plants. Wait till 3 weeks after they break ground.).
At most you'll feed every time you water. If you use Grow More Sea Grow, that's 1/2 tsp per gallon of water. You can feed 1 tsp/gal every other watering. The label says you can also feed 1 Tbsp/gal once per week or two. I've not tried it. But, if you have to water every 2-3 days it's not that hard to dump 1/2 tsp into the water.
You want soil that drains well. You'll probably add 20-30% perlite. You want to water every 2-4 days. If it takes longer than 4, it probably isn't airy enough.
Back to how it's not a houseplant, you'll need to concern yourself with the water you use. Tap water in some areas can have a high TDS (ppm) which competes with (or blocks) nutrients which are also TDS when added to water (measured in ppm). Chlorine and chloramine (worse) can interfere with the soil biology. Your city should have a water quality report which will tell you what you're dealing with. You may need to use reverse osmosis water sold in vending machines. Or, mix it with your tap water to bring it down to something less problematic. If you use 100% RO water you'll need to add a small amount of a calmag product to replace minerals removed by filtering.
If you don't want to wait for a photo-sensitive plant to be driven by outdoor seasonal changes which could take a long time, you can grow an autoflower outdoors. It will bloom without the days getting shorter.
An wen its flowering an harvesting do i feed it to ? Or jus let it sit in the sun an water
There are people who grow with an "all purpose" (npk ratio of 1-1-1) fertilizer through veg and bloom. Most people use veg- and bloom-specific nutes. If you want to use a bloom-specific nute you'd do it after bud sites are formed (either after the season changes and days get shorter, or when an autoflower does it by itself in 6 weeks). You want an NPK ratio around 1-3-2. A lot of people will use a "booster" about 2-3 weeks before harvest. This brings the ratio up to around 1-5-4. You'd use this once or twice in a week, then switch to water only to "cleanse" the plant, let it use up stored nutrients which are reported to make the smoke harsh. Cleanse for 10-14 days. If you misjudge your harvest timeline, there are "flush" substances that may accelerate the cleansing process.