This guide assumes you know what Urbit is. If not, check out my post on that.
Urbit can be a little intimidating when you first get started because it's completely new and we don't have an existing mental model of how it works.
But, here's what you need to know in order to get a urbit planet or star (sometimes called a point).
Step 1: Get an Ethereum address
Ownership of Urbit points is tracked on the Ethereum blockchain. That is the only thing Urbit uses Ethereum for. That means the owner of an Urbit point is whoever owns the Ethereum address where that point resides.
Ethereum addresses are generated by wallets. You will need to get an Ethereum wallet.
There are many types of wallets, but for ease of use, if you don't know what to get, then install Metamask. Alternately, if you want to hold many points and you want superior security you should purchase a Trezor hardware wallet.
Please note that you will not be able to receive Urbit points on exchanges. If someone sends you an Urbit point to an Ethereum address on an exchange you will not be able to claim it.
Step 2: Purchase or acquire a point
Step 3: Accept the transfer
Ethereum points are ERC-741 non fungible tokens, and they can be held in Ethereum addresses, but most (all?) Ethereum wallets cannot see these tokens. You will need to use Urbit bridge as a user interface to your Ethereum address. Log on to Bridge using either Metamask, or Trezor, or your ethereum private key (or whatever wallet you have). You do not have a master ticket if you are buying a planet or star.
Once you are logged in, it should be obvious that there is a point waiting to be claimed. Follow the instructions to claim the point (watch out for gas fees right now). This will require that you have some Ethereum in the same address where you want to accept the point.