Well I don't work with Plutus but to form a relationship with any deity you should start by introducing yourself. Set up an altar for said deity [look up what Plutus favours and build an altar around that. Perhaps print off a photo, or sketch one] leave out some food and water offerings, then light some incense and/or a candle, and call to them. Something simple like 'God Plutus, I wish to learn from you, please accept these offerings of [list items] as a token of my appreciation.' Then sit and meditate before the altar. You may receive a sign right away, or it might take a while, keep your mind open. [When I first contacted my patron Goddess I didn't receive and answer until two days later while I was on lunch.] If you go a full moon cycle without any sign [or you receive a no] thank Plutus and move on for now.
Once you receive a yes or simply an acknowledgement from Plutus you can begin working with him. Try to keep a permanent altar for him. Even if you're in the broom closet, try to keep a small area for him. It could be a shelf with a candle and an incense burner, or a small corner of your desk you keep clean, it would be best to dedicate a space for the God in your room/home somewhere. Look up offerings Plutus likes as well as symbols for him [example, if he's the god of wealth, you could leave him coins, perhaps decorate his altar with some fake jems to represent wealth]
You should also try to take time daily to connect with Plutus. Meditating is a great one, you could also try prayer or daily offerings. Be creative, if you know of rituals that's fine, but you could do stuff in honour of your god [like work hard, save money, donate to charity...] As you grow closer you will discover new ways of worship so keep an open mind.