What you describe has nothing to do with scrolls.
Spell scrolls only do what they say they do: they allow a spellcaster to cast a spell without using up a spell slot. They don't continually radiate the spell's effect or power other magical devices. The items you describe could be viable in theory, but they'd be unique custom items that have nothing to do with spell scrolls.
Making items is largely up to the DM.
It would be entirely up to the DM to determine what is required to create such items and what they'd cost, if they even allow it. The DMG and Xanathar's Guide to Everything lay out some basic crafting rules (more detailed in the XGE) but in each case, for anything other than a scroll or potion, a large part of the crafting process is adventuring to find rare magical components or lore necessary to construct the item, plus a significant cost in gold. The DM determines whether you're allowed to make an item at all, and if so, what rarity the new item would be (common, uncommon, rare, very rare, or legendary) if it's something you've invented rather than from a book or resource. The rarity will determine the gold cost, and gives the DM guidance as they lay out what else you'd need to do to make it. For a "common" item, you may need nothing more than time and gold, while a "very rare" item might require an extensive subquest to find a specific creature or location.
You don't really "enchant a spell into an item"; making an item might require knowledge of a specific related spell (for example, Boots of the Winterlands might require you to know how to cast protection from energy), but it might not. It might require only an appropriate component (say, the skin of a winter wolf or other cold-resistant creature). You would work with your DM to determine what knowledge and components are necessary to make any given item, especially if it's something you've cooked up on your own.
These particular items...
All that said, for the 'nightlight', a simple continual flame spell is probably a cheaper and easier way to get the effect you want than building an actual magic item. If you still wanted to make an item instead, it would probably be a "common" item. You might make it an "everburning candle" that sheds light like the normal item but never goes out.
On the statue doorkeeper, do note that in 5th edition (and 4th, I believe), detect evil and good only detects aberrations, elementals, celestials, fiends, undead, and fey. It doesn't tell you the alignment of regular people, it sort of detects the extraplanar energy of creatures that are from beyond this world (or at least powered by that inherently aligned energy from beyond). You can no longer detect any mortal, even the most twisted and evil mortal. Alignment is a description of how creatures generally act, not a physical property of the game world, and is not detectable by in-game effects, except for a few monsters that can innately sense goodwill or evil intent, like Sprites and Unicorns (or at least a unicorn's lair effects).