This app was mentioned in 11 comments, with an average of 1.45 upvotes
Or there's a cheap official app, or a free third-party web page for the portable device that, these days, most players are going to have. Or, based on the other games FFG have put out, there will likely be a cheap intro box with abridged rules and a dice set, so a group can get a feel for the system before committing to the full purchase.
There are plenty of viable solutions.
I'd like to add that the officially licensed die-roller app is worth the $5. It has dice for all their licensed games (including Genesys and their miniatures games), you can optionally let it handle canceling symbols, and it'll do up to 30 dice at a time. You really only need one copy for your group, but it's a good substitute for the physical dice.
The Foundry VTT ruleset is a solid choice for online play. The character sheet has everything you need for all the Star Wars rulesets, the die-roller handles everything, and there are some really useful add-on modules.
If you're playing in MeatSpace™, I recommend getting tokens from an Othello game for the Destiny pool.
There are two official options and any number of unofficial options.
The official Star Wars dice app is called, appropriately, Star Wars Dice. It is $5, but it also has the dice for all of FFG's dice-based Star Wars games - Armada, Imperial Assault, X-Wing, etc.
There is also the official Genesys dice rolling app. It's free but it doesn't have a Force die (Genesys doesn't use it) and the symbols are Genesys symbols (effectively the same but they look different).
If you search for "star wars dice" you should find plenty of unofficial dice rollers, whether app or web-based.
I prefer real dice for every game possible but half of my group is using the app. Mostly cause it's cheaper than the dice but also cause we are old and those tiny symbols are not fun to stare at LOL
https://play.google.com/store/apps/details?id=com.fantasyflightgames.swdice&hl=en\_US&gl=US
If you have a smartphone or tablet, it's worth getting the official die-roller app. It has dice sets for all of FFG's games (including the ship-combat game and Genesys) along with basic polyhedrals. The FFG dice can even auto-calculate canceled symbols. It's like $3 or $4.
> dice app from fantasy flight
I'd actually recommend it. It has all the various styles of symbols from all their games, along with your standard numeric polyhedrals. You have the option of having a dice pool figure out canceling symbols, to show you the end results along with the dice themselves.
The Google Play Store has it, and they have a separate app for Genesys. The next time I run Star Wars I'm going to browbeat my players into getting the app.
It's possible the app wasn't showing up because it was updated in a way which is no longer compatible with your device, because it's available here.
While Roll20 has a bunch of helpful tools, I think you could run your duet campaign without it. To use Roll20 for a duet campaign feels almost like overkill.
Using just Google Hangouts on your PC, you can share your desktop screen with him and he can view any application you are running. There also seems to be a way to pump your PC's system audio through Hangouts... For epic music and ambient sound.
If he's in the truck and just looking via on the tablet, you can set up a character by talking it through together with a form fill-able PDF character sheet on your PC. Alternatively, he can build the character ahead of time, make a copy of the sheet for you to keep, and take his copy OTR.
I'm not too familiar with the EotE Dice Tool for Google Hangouts already mentioned by /u/MCKhaos, but if it can be run on his Android tablet then he can roll no problem. Otherwise, try to see if the official Star Wars Dice App for Android can run at the same time as a Hangout without suspending the connection/video-call. I think the most important thing is finding him a way to roll dice for himself. You could roll for him based on what he describes his character doing, but I have a bad feeling about how frustrating that setup might become.
Maps can be done in any image editing program (Photoshop, the GIMP, even Illustrator or Inkscape). Just make a layer for the background, a layer for the tokens, and a layer for fog of war (paint bucket black) that you erase away as he explores. Roll20 can do things like this, but with just two people you can get away without it.
Wookiepedia is your friend, especially if he takes things off the rails (and many of the free adventures are really on rails). Build out extensive locations and a fair number of NPCs nearby to where these adventure modules are taking place. Have NPCs with intentions and plans and rivalries, but don't set out a plot. Most of all, just be confident that you will craft (and improvise) a fun, satisfying experience. I used to worry a bunch about prep for sessions (with much larger parties than a Solo), but as I've become more experienced my prep has decreased at least 80%. I build locations, NPCs, and NPC motivations/goals in great detail, but then I improvise almost all the plot. The players seem to have just as much fun as they did when I meticulously planned the story. More, even.
May the Force be with you!