I'm building an Imperial fist space marine army and im wondering what I should invest in next.
You see im still rusty on the
40k game after taking a long year or so break from it, so where I used to be sure of what to buy for an army, now im not so sure.
I find myself second guessing or sometimes not buying anything at all because im not sure where to take this army build, as ive never collected marines before. Ive always been more of an alien player so things like Tyranids, Tau, Necrons but marines I don't know what im supposed to be doing.
So far I have:

Master of the forge for an
HQ (this is temp as im going to replace him with a normal space marine commander and put him elsewhere)

2 squads of tactical marines (each with 1 heavy bolter)

Drop pod

Devistator squad (two missile launchers, two lascannons)

Stormtalon (yet to be constructed)
As you can see I have the basics but no idea what to do or where to go from here, any advice and options would be helpful to this new marine player.
As for play style im rather orkish in tactics, I like heavy tough things and basically like to smash down heavy units that I know can handle themselves, back them up with tanks and heavy weapons.