18 OPs is a little thin. It's probably possible, but keep in mind that your average 1-15'r spent more than that on a single piece of gear.
I would just focus on Int for now. Enchant a little as you go. Work on your gear over time. When you start to upgrade and replacing pieces with Worship, then I would start thinking Rec. In the meantime, orange stats in HP and squeezing in some enchants over time would be the way to go. The good news is that Mystic Lv6 are dirt cheap these days.
So on an 18 OP budget:
- Dagger, Gloves, Top, Bottom linked with Mystic Lv6. Do this on linking bonus weekend when you get +10% linking chance so that you don't need to use hammers. Shop around and get good deals for your lapis. Don't be an impulsive buyer! There's never a shortage of Lv6s. Cost: About 3 OPs.
- Helm linked with INT Helm Lapis and Life Lv6. Helm Lapis can be a little rare, but hold out and don't pay a stupid price. There's always a better deal coming. Life Lv6 are dirt cheap and will really help you out since you're skipping Rec. Again, wait for that +10% linking bonus and don't be an impulsive buyer. Cost: About 3 OPs.
- Dagger enchanted to about . There's also times when there's double or triple linking bonus. At this point, I wouldn't worry about the enchant letters, but they're definitely come in handy later when you do future upgrading. Cost: About 5 OPs.
- Gloves, Top, and Bottom enchanted to about . Same as with dagger enchanting, wait for the bonus. Armor enchanting at this level actually has a higher chance than weapon, so you should be able to get the 3 pieces to  on 9 Lapisia. Cost: About 4 OPs.
- +200 HP or higher on all pieces of armor. With all of your remaining OPs, go for this. Ideally, you want 300 or 400 on each piece except boots (boots can't be higher than 200). There are no bonus events for this, so just have at it whenever the rest of your stuff is done. Hint: Buy your Rec Runes during 2 for 1 Rec Rune sales. This is when AP buyers buy and flood the market and you'll get the best price on them. Cost: All remaining OPs.
- Replace pieces with Worship to allow both Int and Rec in gear.
- Ele II in weapon.
- Higher enchants on weapon with enchant letters.
- Better orange stats, higher armor enchants, etc.