If you want pact of the chain you may have to just put your sword away when you cast spells, which honestly isn't that big a deal since you aren't using the cantrips from sword coast adventurer's guide. Without them your sword is worse than eldritch blast in terms of damage output. I'd stay ranged most of the time, since even with armor and a shield you will have pretty low hit points. I'm not the biggest multiclassing expert, so even though there are builds that can hold their own in melee I don't know them off hand.
I figure I should address the level expectations as well, unless you go to conventions expect to top out around levels 11-15 depending on the campaign. The exception is if you go to a shop with a group of players that have high level characters already and enough dms to handle new people showing up, in which case you may get to occasionally play in high level modules. My local shop, for example, has plenty of high level characters but not enough dms to run a table specifically for levels that high when there are always people ready to play lower levels.
I figure I should address the level expectations as well, unless you go to conventions expect to top out around levels 11-15 depending on the campaign. The exception is if you go to a shop with a group of players that have high level characters already and enough dms to handle new people showing up, in which case you may get to occasionally play in high level modules. My local shop, for example, has plenty of high level characters but not enough dms to run a table specifically for levels that high when there are always people ready to play lower levels.