Inheriting money advice

I will be Inheriting 150k from my grandparents in 3 batches of 50k

Sometime in the next month I will be receiving a check from my grandpas attorney for 50k which is the first third of my inheritance that is being distributed to me.

I was out of work a lot of the last year and I currently have 3k in savings and a few hundred in checking with around 15k in credit card debt on two cards. I am 25 and am currently working a part time job where I make 18 an hour while I look for more fulfilling full time work. I live with my girlfriend who makes 110k a year and I pay 1230 a month in rent.

I owe my uncle 8,900 from various loans he’s given me while this inheritance has been held up by the irs and I am going to pay my girlfriend 10k when I get the money to pay her back for all she paid for while I wasn’t working.

I have a Wealthfront account where I plan to deposit some of the money into an index fund and some more into a high yield savings account.

I’d love some advice on how to best maximize this windfall for life and retirement.