Randomize will let you choose a couple of options and the builder will do everything else and make a random character. When you enter the Character Builder for a new character you will be presented with three options as follows: It is therefore recommended to make a new character for a campaign using the campaign join link to ensure you are using everything available to you. If you choose to make a new character and Content Sharing is enabled for that campaign you will have access to any non-free content purchased by any other player in that campaign. Use this link to be taken to a page where you can either: add a character you have made previously, take control of an unassigned pre-made character or make a new character. If you are to join a Campaign you will be given a Join link by the Dungeon Master (DM). Either way you will be taken to the Character Builder which you can use to make your character. Alternatively you can choose the Characters menu and then Character Builder. You can go to My Content menu at the top-left of any page of this site then Characters and then click on the Create A Character button on the top-right. To begin making a character you can go to the Character Builder page. This will hopefully help you make a Level 1 character using the builder.

The guide will detail what you will see, what options mean what, and what things do. This guide will assume you have read the Basic Rules on character creation and just want help using the builder. This guide is not about going through the character creation process in general and will not be about choosing what class or race or tell you what Feats are. This guide is designed to help you make a Level 1 character using the Character Builder. Monstrous Compendium Volume One: Spelljammer Creatures

5e character builder instructions