これから details

from now on + write

kore kara kaku

from now on; after this — the stretch of time that starts at this moment

meaning: write from now on

この日記にっきは、これから続けるつづけるつもりだ。

kono nikki wa, kore kara tsuzukeru tsumori da.

This is a diary I intend to continue from now on. neutral

用事ようじ、終おわった？これからどうする？

youji, owatta? kore kara dou suru?

Done with your errands? What are we doing now? casual

Examples

from now on; from here — the speaker draws a line at the present and talks about what follows it

この日記にっきは、これから続つづけるつもりだ。

kono nikki wa, kore kara tsuzukeru tsumori da.

This is a diary I intend to continue from now on. neutral

用事ようじ、終おわった？これからどうする？

youji, owatta? kore kara dou suru?

Done with your errands? What are we doing now? casual

これから寒さむくなりますので、体からだに気きをつけてください。

kore kara samuku narimasu node, karada ni ki o tsukete kudasai.

It will be getting cold from here on, so please take care of yourself. neutral

これからもご指導しどうのほど、よろしくお願ねがいいたします。

kore kara mo go shidou no hodo, yoroshiku o negai itashimasu.

I ask for your continued guidance going forward. formal

これから can also fill a noun slot for the time ahead — これからの
予定よてい, これからが本番ほんばん — modifying a noun rather than the verb.

ていく
〜ていく in its aspectual sense carries a change forward from inside the predicate and needs a verb of change to ride on (増ふえていく); これから fixes only the STARTING point at now and modifies any predicate at all, change or not.

てから
Both end in から and both order events, but これから counts from this moment and stands on its own, while 〜てから needs a verb in front of it and counts from that act — 食たべてから is "after eating", これから "starting now".