Antares is a bit more complicated and granular than Bolt Action.
Partly, this stems from being D10 based rather than D6, and partly it's due to the wider range of equipment/technology and unit profiles available.
If you've played BA already, then unit activation and orders, as well as a few other elements, will already be familiar to you. Other stuff, like drones, grenades, weapon types, armour types, etc will take a bit of learning though.
A few things to note;
The main rule book is a bit of a mess when it comes to presenting, explaining, or finding rules. Make sure you get the latest FAQ, and I think there's a downloadable index too.
Army lists in the books have all been superseded by the free ones available from Warlord. Use these, as they are better and more balanced than the book ones.
A new second edition of the game is being worked on. How far away this is from release, I don't know, but the new edition is definitely coming.
From experience, whilst some units benefit from having a few extra models added to them, minimum unit size (or close to) is generally the most useful.
Make sure you have a fair amount of terrain on the table. If in doubt, err on the side of putting more down rather than less.