What I have seen of the instructions, they seem to be easy enough to follow without being able to read Japanese, with good illustrations of what goes where & how. Remember to go through them carefully, though, looking out for tricky bits & for places where you'll need to paint
before the area becomes inaccessible when glued together (dry fitting helps with this) - marking these with a highlighter pen isn't a terrible idea. Some of these Macross kits are moveable &, unless you don't want it "transformable" you need to watch out for this when inspecting the instructions & during the build.
Any plastic cement will do; Tamiya, Humbrol & Revell all do good ones. Get the brush-on or precision tip bottles if you can & use sparingly.
As said, use the glue sparingly & apply to both surfaces being glued. ALWAYS dry fit first, to see how well the parts fit.
Sanding is a matter of what the task at hand is but investing in some decent fine grade (600+ grit, up to 3000 grit) sanding sticks is a good idea. A good set of quality small files is another good investment & are often needed to get the edges of the parts to fit flush.
Painting: Probably too early to invest in an airbrush (& some don't like them, anyway) but
always invest in
good quality paint brushes & treat them well. There are a gazillion paints out there & that is ALL a matter of preference.
Others may have better advice & be able to link to things like English versions of the instructions but I hold by the above for all general modelling.
Hate to say it but, if the below are what you got, you may have paid a bit too much, unless there was "free" postage;
https://www.1999.co.jp/eng/10343492https://www.1999.co.jp/eng/10308073