I am only familiar with the PC Java edition of Minecraft, but I am pretty sure that even in the Bedrock version villagers will not generate in an abandoned village, no matter how many beds you place in them.
If a village is abandoned or all the villagers have been killed by mobs, you have to bring at least two villagers into the village and encourage them to breed in order to repopulate the village. You can either transport villagers from another village or you can capture and cure zombie villagers. Once you have two villagers, you only have to make beds for them and feed them to get them to breed. You can learn all about villagers on the Minecraft Wiki https://minecraft.gamepedia.com/Villager
If you are thinking of travelling to the Nether so soon, you might want to consider whether you want to wait until the new Minecraft version 1.16 with the new Nether is released. It should be available very soon.
Regarding what direction to take the game in, that is really a matter of personal preference. If you enjoy automated farms, then you can make some. If you want to build railroads, you might want to look for some abandoned mine shafts to clear out for rails, etc. I personally like to build a comfortable base where I feel at home, but maybe you prefer to wander about. I played Minecraft for three years before I fought the Ender Dragon, but maybe that is something you want to do really early on. There is no right or wrong way to play Minecraft, which is the best thing about it. I usually get ideas for doing new things by watching YouTube videos.
Typical This forum is more for Java, not Bedrock (which is what you got on Android), and some things work differently, namely village mechanics.
Farms are always a fine idea if you seek to automate repetitive aspects of game you don't enjoy much. But again, if looking for farm designs, make sure they are for Bedrock, not Java.
Nether offers a lot of benefits. Fast travel, access to unlimited lava (furnace fuel), Quartz for redstone observers and comparators, Potion brewing. Also needed for End access. In general, Nether is fairly tame, biggest hazard is lava. Upon entry, do a quick survey where you are and whether you have any lava flows going towards your portal. You generally want to go in with a few stacks of cobblestone and immediately build a protective enclosure around the portal. Occasionally, you may get a real bad starter portal location (i.e. small cave under lava ocean, tiny island floating in the air over a lava ocean), but that is rather rare.
Villages are generally not abandoned. Most likely what happened is you were active within 128 blocks of the village at night, and zombies killed the villagers off. Villagers will NOT respawn on their own, regardless of how many beds you add. Mind, that is for Java, maybe this is true for bedrock. Rule of thumb: if you find a village, you either want to protect it with a fence and light everything up, or stay more than 128 blocks away, or make sure you sleep through the nights if you want to preserve villagers. To repopulate a village, you either need to find another village and transport some villagers over using minecarts or boats, or wait around during night, see if you get any zombie villagers spawn, trap them, and then cure them.
Typical game progression:
Get yourself some decent enchanted diamond gear. A lot of people will build a hostile mob XP farm to have ready source of enchanting XP and various mob drops. Cultivating a village for a steady source of diamond gear and enchanting books can be very beneficial. Explore Nether for a fortress, get blaze rods, so you can brew potions and make Eyes of Ender.
Using Eyes of Ender, find a stronghold, activate portal, go into End, defeat dragon. Then you can explore the End, look for end cities with ships, so you can claim an Elytra. Once you got one Elytra, getting a couple spares is easy. Get shulker boxes to make your inventory limitations go away.
After this, it is whatever you want. Mind, all doable without going into End, but having Elytra nd shulkers makes things way easier.
Find and raid an Ocean monument, a woodland mansion. Tackle some pillagers, spawn and defeat village raids, farm wither skeleton heads and spawn a Wither. Build a beacon. Go explore to find rarer biomes. Go for various achievements. Build farms that give you all sorts of resources for advanced builds, and so on.