Yes, a boxed curriculum with support sounds like it would be the best decision for you. There are MANY fully accredited homeschool curriculum these days. And honestly, as someone who worked in higher ed–you are only doing your kid favors by using a curriculum.
Once you have an established schedule homeschooling with an 8 and 2 year old is VERY do-able.
Remember, while a child is in school there is TONS of “wasted” time–more on this later.
You can do many things together that benefit the 8 yo and entertain the 2yo. Does your little one still nap?
My schedule with a 10yo and toddler went like this
8am Breakfast, prayers, chat
8:30 School start. Toddler got a toy while I got big kid started on an “independent” subject, typically reading. She read, I played with the toddler and did chores.
We’d go on and off like this till lunch. At lunch, typically noon, we’d pow-wow again and all talk about our day. Well–toddler would mostly just make noise but we let her “talk”. We then went for a walk/bike ride/snowshoe and then big kid had off until nap time.
At 1:30 it was nap time and I had 2 hours to focus on getting down to what “really” needed to be done. Most days we were done in 45 minutes to an hour and a half. Only when big kid had a bad day did we need more time.
And 3:30 got the toddler up, both had a snack and it was play time.
Some days our AM had an activity (Mondays we had a social/STEM group and Thursdays she had science class–at one of 3 places that coordinated the schedule) so we took the entire nap time to do subjects.
Other field trips we planned WAY in advance so it was a day off of school.
And we were doing Seton–so not exactly a walk in the park.
One thing the “wasted” time in school is often learning things like taking turns, waiting and patience. Homeschoolers NEED to seek these sorts of situations out if they want to have an adult who can manage these situations.