Hi @camelia, first of all - so sorry to hear about the loss of your Uncle.
***** STOP PRESS!!! ******
I am also a Star Wars fan, - not a huge one, but I know from all the movie franchises this is possibly the biggest of them all and have some of the most expensive toys ever made.
You might know that rare Star Wars toys are actually worth a LOT of money!
As an idea one of my old school friends sold a Luke Skywalker with some form or retractable light sabre and it sold for around $18,000 US dollars in an auction. So be so careful not to give these away at low prices. From memory I know some figures in auction go for $50,000 onwards.
Many items could do well in sales in auction houses too - so they need to be filtered out from standard to rare.
Before selling them - I would join many of the Star Wars forums on the internet and Facebook groups for star wars collectors. Before diving into the cost of the items, get an idea of what is valuable and rare and post images of items etc.
If you are to set a fixed fee - then try high on the rare ones. Collectors will pay anything to get their prize.
Good luck and think carefully on the valuation - but an Auction would be my choice if he was a serious collector - to me, amazon and a set fee could cost you a lot of £$£$£!