Problems arise when designing database for ecommerce

Hi guys, first of all i dont know if it appropriate to post such topic.. But please help me out.
So im a newbie in database design, and i want to have a practice.
Then im thinking about practicing to make fashion online shop website(it will sell shoes, t-shirt, shirt, accesories, etc)

So first of all i design my database for customers, products, and orders, i come up with 5 tables:

1. customers

• customer_id
• email
• password
• first_name
• last_name
• registration_date

2. products

• product_id
• type_id (refers to type table)
• price

3. type

• type_id
• name
• description

4. order_log

• order_log_id
• order_description_id (refers to order_description table)
• customer_id (refers to customer table)

5. order_description

• order_description_id
• product_id (refers to product_id)
• quantity
• price
• date

so after seeing my own design, im thinkin "Oh my God, for type like shoes/t-shirt/shirt they will have a size!, but accesories dont" the questions are:

1. should i add 1 more table like product_description? so in the product table, there will be product_description_id. If the product_description_id is 0, then it doesnt have any more description like size, but if its not 0 then it has..

2. i find that my database design a bit ermm awkawrd.. can u guys give some tips to optimize it?

thx for reading the long post! i really appreciate it, i dont have any computer backgrounds nor computer education, im an accountant student whose wanted to learn web + database, please do support