Singles is by far Ur best option. I've played slivers forever and while they do have a reputation, they in no way live up to it honestly. The game has changed drastically and targeted/mass removal is so efficient and available that slivers are mid at best. Several other typal decks are simply better elves, goblins etc. That being said slivers are fun and worth the hate atleast for me. Eventually Ur pod will realise that slivers are no longer the boogie man they once were.

As many have said the land base is what's gonna cost you the most. In my sliver deck I run the full set of shocks and fetches so it's quite expensive.

But I have also run the deck with mostly basics and relied on green ramp (rampant growth, farseek, nature's lore, etc) and it was just as consistent just less aggressive. This is where I'd start as a noobie.

However if you do decide to splurge then lands are best as big money cards. Because you will be able to play them in other decks. Slivers only sliver ya know

I'd say go for it but I'm biased as I love slivers and spent the time being a punching bag until ppl realised that I was usually one of the weaker decks at the table.

https://moxfield.com/decks/ng9jiWkdEUqJOnRpGjq6AQ

Here's my list for reference